Asimina triloba

This article is about the common pawpaw of eastern North America. For the unrelated tropical papaya fruit often called 'papaw' or 'pawpaw', see Carica papaya. For other uses, see Paw Paw (disambiguation).

Asimina triloba
In fruit

Secure  (NatureServe)[2]
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Magnoliids
Order: Magnoliales
Family: Annonaceae
Genus: Asimina
Species:
A. triloba
Binomial name
Asimina triloba
Natural range

Asimina triloba, the American papaw, pawpaw, paw paw, or paw-paw, among many regional names, is a small deciduous tree native to the eastern United States and southern Ontario, Canada, producing a large, yellowish-green to brown fruit.[3][4][5] Asimina is the only temperate genus in the tropical and subtropical flowering plant family Annonaceae, and Asimina triloba has the most northern range of all.[6] Well-known tropical fruits of different genera in family Annonaceae include the custard-apple, cherimoya, sweetsop, ylang-ylang, and soursop.

The pawpaw is a patch-forming (clonal) understory tree of hardwood forests, which is found in well-drained, deep, fertile bottomland and also hilly upland habitat.[7] It has large, simple leaves with drip tips, more characteristic of plants in tropical rainforests than within this species' temperate range.[8] Pawpaw fruits are the largest edible fruit indigenous to the United States[9][10] (not counting squashes, which are typically considered vegetables rather than fruit for culinary purposes, although in botany they are classified as fruit).[3]

Pawpaw fruits are sweet, with a custard-like texture, and a flavor somewhat similar to banana, mango, and pineapple. They are commonly eaten raw, but are also used to make ice cream and baked desserts. However, the bark, leaves, fruit, and seeds contain the potent neurotoxin annonacin.[11]

Names

[edit]
Flower parts and stages (female at bottom, pollen-rich male at right)
Ripe fruit of Asimina triloba, cut open to reveal the large seeds

This plant's scientific name is Asimina triloba. The genus name Asimina is adapted from the Native American (probably Miami-Illinois[12]) name assimin or rassimin[13] combining the root terms rassi= "divided lengthwise into equal parts" and min= "seed, fruit, nut, berry, etc."[14] through the French colonial asiminier.[15] The specific epithet triloba in the species' scientific name refers to its lobed fruits (three lobes, "fructibus trifidus," in Linnaeus' original description).[16]

The common name of this species is variously spelled pawpaw, paw paw, paw-paw, and papaw. It probably derives from the Spanish papaya, an American tropical and subtropical fruit (Carica papaya) sometimes also called "papaw",[17] perhaps because of the superficial similarity of their fruits and the fact that both have very large leaves. The name pawpaw or papaw, first recorded in print in English in 1598, originally meant the giant herb Carica papaya or its fruit (as it still commonly does in many English-speaking communities, including Australia, New Zealand, and South Africa). Daniel F. Austin's Florida Ethnobotany[18] states that:

The original "papaw" ... is Carica papaya. By 1598, English-speaking people in the Caribbean were calling these plants "pawpaws" or "papaws" ... [yet later, when English-speakers settled in] the temperate Americas, they found another tree with a similarly aromatic, sweet fruit. It reminded them of the "papaya", which had already become "papaw", so that is what they called these different plants ... By 1760, the names "papaw" and "pawpaw" were being applied to A. triloba.

Yet A. triloba has had numerous local common names, many of which compare it to a banana rather than to Carica papaya. These include wild banana, prairie banana, Indiana banana, Hoosier banana, West Virginia banana, Kansas banana, Kentucky banana, Michigan banana, Missouri banana, Appalachian banana, Ozark banana, Indian banana, banango, and the poor man's banana, as well as American custard apple, asimoya,[19] Quaker delight, and hillbilly mango.[20]

Several tribes of Native Americans have terms for the pawpaw such as riwahárikstikuc (Pawnee),[21] tózhaⁿ hu (Kansa),[22] and umbi (Choctaw).[23]

Description

[edit]
Pawpaw produces flowers before its leaves emerge.

A. triloba is a large shrub or small tree growing to a height of 35 ft (11 m), rarely as tall as 45 ft (14 m), with trunks 8–12 in (20–30 cm) or more in diameter. The large leaves of pawpaw trees are clustered symmetrically at the ends of the branches, giving a distinctive imbricated appearance to the tree's foliage.[13][24]

The leaves of the species are simple, alternate and spirally arranged, entire, deciduous, obovate-lanceolate, 10–12 in (25–30 cm) long, 4–5 in (10–13 cm) broad, and wedge-shaped at the base, with an acute apex and an entire margin, with the midrib and primary veins prominent. The petioles are short and stout, with a prominent adaxial groove. Stipules are lacking. The expanding leaves are conduplicate, green, covered with rusty tomentum beneath, and hairy above; when fully grown they are smooth, dark green above, and paler beneath. When bruised, the leaves have a disagreeable odor similar to a green bell pepper. In autumn, the leaves are a rusty yellow, allowing pawpaw groves to be spotted from a long distance.[3][13][24]

Pawpaw flowers are perfect and protogynous,[25] about 1–2 in (3–5 cm) across, rich red-purple or maroon when mature, with three sepals and six petals. They are borne singly on stout, hairy, axillary peduncles. The flowers are produced in early spring at the same time as or slightly before the new leaves appear, and have a faint fetid or yeasty smell.[3][13][24][26]

The fruit of the pawpaw is a large, yellowish-green to brown berry, 2–6 in (5–15 cm) long and 1–3 in (3–8 cm) broad, weighing from 0.7–18 oz (20–510 g), containing several brown or black seeds 1⁄2–1 in (15–25 mm) in diameter embedded in the soft, edible fruit pulp. The conspicuous fruits begin developing after the plants flower; they are initially green, maturing by September or October to green, yellowish green, or brown. When mature, the heavy fruits bend the weak branches down. Full ripening often happens only after the fruit falls naturally, thus signifying a seed dispersal strategy aimed at ground-based, rather than arboreal, mammals.[3][13][24][27]

Other characteristics:

  • Calyx: Sepals three, valvate in bud, ovate, acuminate, pale green, downy[13][24]
  • Corolla: Petals six, in two rows, imbricate in the bud; inner row acute, erect, nectariferous; outer row broadly ovate, reflexed at maturity; petals at first are green, then brown, and finally become dull purple or maroon and conspicuously veiny[13][24]
  • Stamens: Indefinite, densely packed on the globular receptacle; filaments short; anthers extrorse, two-celled, opening longitudinally[24]
  • Pollen: Shed as permanent tetrads[28]
  • Pistils: Several, on the summit of the receptacle, projecting from the mass of stamens; ovary one-celled; stigma sessile; ovules many[24]
  • Branchlets: Light brown, tinged with red, marked by shallow grooves[24]
  • Winter buds: Small, of two kinds, the leaf buds pointed and closely appressed to the twigs, and the flower buds round, brown, and fuzzy[13]
  • Bark: Light gray, sometimes blotched with lighter gray spots, sometimes covered with small excrescences, divided by shallow fissures; inner bark tough, fibrous; bark with a very disagreeable odor when bruised[13][24]
  • Wood: Pale, greenish yellow, sapwood lighter; light, soft, coarse-grained and spongy with a specific gravity of 0.3969 and a density of 24.74 pounds per cubic foot (396.3 kg/m3)[13][24]
  • Longevity of fruit production: Undetermined[29]

Range and ecology

[edit]

Asimina triloba is a member of the Annonaceae family, commonly referred to as the "custard-apple" or "soursop" family. Annonaceae are a diverse group comprising the single largest family of the order Magnoliales. They are a tropical family consisting of 112 accepted genera with about 2,200 species spread primarily across South America, Africa, and Southeast Asia.[30]

The pawpaw is an exception to this pattern, as it is the most temperate member of its family. Its range extends as far north as the southern portion of Ontario, Canada. Within the United States, pawpaw is native to the eastern, southern, and midwestern states, ranging from New York westward to southeastern Nebraska, southward to eastern Texas and the panhandle of Florida.[3][31][32] The tree is commonly found in the wild within or along the slopes of floodplains and shady, rich bottomlands,[33] but it requires somewhat elevated slopes because it has a deep-reaching taproot.

Hybridization with other Asimina species

[edit]

The common pawpaw is the largest and most well known of the 13 species of the Asimina genus in North America. Of those 13, 11 prefer very warm weather and have ranges rarely extending northward of Florida or coastal Alabama. Their ranges do not overlap with Asimina triloba.[citation needed]

One southern USA species, Asimina parviflora, does overlap in range with pawpaw. This species is smaller than pawpaw in both its flower and its woody growth. A. parviflora is more shrublike, rarely growing even a third as tall as pawpaw. Genomically verified hybrids of A. triloba and A. parviflora have been classified as Asimina piedmontana.[34]

Pollination

[edit]
Downward-hanging pawpaw flowers attract many kinds of insects that are not effective cross-pollinators. Female flower stage at left; male at right.

Pawpaw are self-incompatible, meaning pollen cannot fertilize flowers on the same plant.[35] This, coupled with the pawpaw's tendency to form clonal patches can reduce fertilization success. A single patch consisting of many stems may therefore produce no fruit if all stems are genetically identical. Fruitless pawpaw patches have been documented in Ohio.[25]

The floral scent of Asimina triloba has been described as "yeasty", which is one of several features that signify a "beetle pollination syndrome".[36] Other floral features of pawpaw indicative of beetle pollination include petals that curve over the downward-pointing flower center, along with food-rich fleshy bases of the inner whorl of petals. A "pollination chamber" is thereby created at a depth that only small beetles can access during the initial female-receptive stage of floral bloom. As with other well-studied species of Annonaceae, the delay in the shift from female to male floral stage offers beetles a secure, and possibly thermogenic, residence in which not only to feed but also to mate.[37] Receptive stigmas at their arrival, followed by pollen-shedding stamens during pollinator departure, are regarded as an early form of mutualism evolved between plants and insects that is still dominant in the most ancient lineages of flowering plants, including the Magnoliids (of which Annonaceae is the most species-rich taxonomic family).[38]

Glischrochilus quadrisignatus ("Four-spotted sap beetle") is one of two tiny beetle species documented deep inside pawpaw flowers in Michigan.[39]

Beetles are the dominant form of pollinator ascribed for genera and species within the Annonaceae family. However, two species of genus Asimina (Asimina triloba and Asimina parviflora) bear a floral character that has given rise to an alternative hypothesis that carrion or dung flies are their effective pollinators. That floral characteristic is the dark maroon color of the petals.[40][41] Hence, while no scholarly papers have documented carrion or dung flies as effective pollinators in field observations, the strength of this hypothesis has led to placement of carrion during the bloom time in pawpaw orchards by some horticultural growers.[8][42]

Professional papers on genus Asimina and its species have warned of the difficulties in discerning whether insects observed on or collected from flowers are effective pollinators or merely casual and thus opportunistic visitors.[41][43][44]

A citizen science project in southern Michigan utilized natural history forms of observation, along with video and photo documentation, during a "pawpaw pollinator watch" in May 2021.[39] Two species of tiny sap beetle were reported as the most abundant and the most consistently present insect types at depth within the flowers, and thus as the most likely effective pollinators. The two species are Glischrochilus quadrisignatus and Stelidota geminata. Both are in the taxonomic family Nitidulidae. Nitidulid beetles are described by Clemson University as likely "night flying" pollinators of pawpaw.[45] Larvae and adult beetle stages of Glischrochilus quadrisignatus were also documented by the citizen project on the ground-level side of rotting fruit in a pawpaw orchard in Michigan following the fruit harvest.[39]

Seed dispersal

[edit]

Until the expansion of humans into North America at the end of the Pleistocene, dispersal of pawpaw seeds would primarily have occurred via the dung of certain megafauna (such as mastodons, mammoths, and giant ground sloths). [46] The fruit of pawpaw is thus recognized as having coevolved with large mammals serving as long-distance seed dispersers.[46][47][48]

The megafaunal dispersal syndrome is a common feature of some plants native to the Western Hemisphere, where a large proportion of megafauna went extinct near the end of the glacial episodes. Such fruits are now regarded as evolutionary anachronisms.[27] Their anatomical features, such as seeds too big for today's fruit eaters to swallow and then defecate, means they are no longer well adapted for current ecological conditions.[49]

The fruit of pawpaw tends to remain green or become blotched with brown at peak ripeness.

Another indicator of dispersal adaptation for megafauna is that pawpaw fruit (wild types and most cultivars) tend to remain green or become blotched with brown when at peak ripeness. Mammals (other than primates) rely on olfactory rather than visual clues for discerning ripe fruit, so fruit color is no signal of ripeness for large mammals. An advantage of maintaining green fruit skin throughout the ripening process is that photosynthesis can continue during this time.[27]

Following the extinction of much of the ice age megafauna, bears would have continued dispersing pawpaw seeds in their dung. Hand carrying of fruit and seeds by humans expanding from Asia into North America would have extended the range of long-distance seed dispersal.[33][50][51][52][53] Humans intentionally continue this role today via horticultural plantings, along with wild plantings as far north as Massachusetts,[54][55] Pennsylvania,[56][57] and Michigan.[58] Small mammals, including raccoons, gray foxes, opossums, and squirrels, assist in local movements of seeds.[59]

Interactions with herbivores

[edit]
Wild-planting of pawpaw, Asimina triloba, is occurring in Pittsburgh for recovering a butterfly whose caterpillars eat only pawpaw leaves.[57]

Pawpaw defends against herbivory by producing strong-smelling natural toxins known as acetogenins.[60] Pawpaw leaves, twigs, and bark are therefore seldom consumed by rabbits, deer, or goats,[61] nor by insects.[3] However, mules have been seen eating pawpaw leaves in Maryland.[62]

Larvae of the zebra swallowtail (Eurytides marcellus), a butterfly, feed exclusively on young leaves of A. triloba and various other pawpaw (Asimina) species, but do not occur in great numbers on the plants.[61] Chemicals consumed by the caterpillars confer protection throughout the butterflies' lives, as trace amounts of acetogenins remain present, making them unpalatable to birds and other predators.[63] A partially citizen-led project in Pittsburgh, Pennsylvania is working on restoring pawpaw for the purpose of encouraging return of the zebra swallowtail as well as the general restoration of riparian areas.[57][64]

In June 2024 a zebra swallowtail was documented laying eggs on a backyard pawpaw plant in Pittsburgh. This was the first time that this butterfly species was seen there since industrialization and river slope destruction had decimated its plant host. A local news editorial wrote, "The return of the zebra swallowtail, after 87 years, is a huge success for naturalists, conservationists and native tree lovers.... Organizations like Grow Pittsburgh, Tree Pittsburgh, the Pittsburgh Parks Conservancy and dedicated chat groups for Pittsburgh conservationists made the zebra swallowtail butterfly’s restoration possible."[65]

Other insects that have evolved the ability to consume pawpaws include Talponia plummeriana, the pawpaw peduncle borer, whose larvae can be found in flowers, and Omphalocera munroei, the asimina webworm, whose larvae mostly feed upon leaves.[66]

Patch-forming clonal growth

[edit]
All the stems in view are part of a wild pawpaw patch in Michigan.
Pawpaw forms wild patches by growing shallow outward stems.

Pawpaw is well suited to life as an understory tree. Its large seed enables significant below-ground growth before the above-ground growth needs to access sunlight for photosynthesis. As well, the species is so shade-adapted that propagation of seedlings in nursery and landscape settings may fail if the emerging plants are not protected from direct sunlight.[67]

Patch-forming clonal growth is achieved by way of shallow, horizontally spreading stems (rhizomes). By retaining these interconnections, photosynthates can be shared among the stems (ramets). Stems that access sunlight can grow as tall as 30 feet and will bear the most fruit. Stems that develop under canopy shade tend to curve and bend in quest of sunlight patches, with a greater density of small stems than where the tallest stems have captured the canopy positions.[68]

Pawpaws are not the first to colonize a disturbed site, but because they are capable of growing in deep shade, they can establish from seed beneath mature deciduous trees and then spread into a subcanopy patch. They may even become dominant through time by depriving native canopy trees from re-establishing via seed in a treefall gap, owing to the dense shade within a pawpaw patch. Under such circumstances, the pawpaw subcanopy becomes the forest canopy, albeit at a height half as high as the usual canopy of native trees.[59][69] Accessing full sunlight, the patch is then capable of producing more fruit.[39]

Shifting dynamics

[edit]

Pawpaw is predominantly a lowland species associated with moist but well-drained soils. Recently it has been colonizing drier upland forests.[35]

Upslope expansion has been attributed to a lessening of human-set fires within forested habitats of the eastern United States. Unlike common canopy trees such as oaks and pines, pawpaw has no resistance against ground fires. So a reduction in fires has enabled pawpaw, as well as other shade-adapted native trees (including American beech and striped maple), to become more common.[35] As well, because toxins in the bark, twigs, and leaves of pawpaw repel herbivory, forests browsed by overpopulated deer offer pawpaw even more competitive advantages.[70]

Pawpaw exhibits a high tolerance for intense shading, even compared with other shade-adapted species such as striped maple.[71] Pawpaw leaves cast very heavy shade, and this chokes out seedlings and saplings of most canopy species (though not native spring herbs that benefit from the late-leafing habit of pawpaw).[72]  This helps pawpaw outcompete rival species and is a contributor to its increased abundance in forests across its range.

Conservation

[edit]
Stems of pawpaw at a wild patch in Michigan in early spring
Spring herbs flourish in a wild pawpaw patch because pawpaw leaves are slow to emerge.

On a global (range-wide) scale, the common pawpaw (A. triloba) has a NatureServe global conservation rank of G5 (very common). The species is, however, listed for conservation concern in the northernmost parts of its range, owing to the happenstance of where governmental boundaries exist. In the United States, the species has an N5 (very common), but is considered a threatened species in New York,[73] and an endangered species in New Jersey.[74] In Canada, where the species is found only in portions of southern Ontario,[53] it has a rank of N3 (vulnerable), and a NatureServe subnational conservation rank of S3 (vulnerable) in Ontario. The Ontario Ministry of Natural Resources has given the species a general status of "Sensitive", and its populations there are monitored.

In areas in which deer populations are dense, pawpaws appear to be becoming more abundant locally, since the deer avoid them but consume seedlings of most other woody plants.[62][75]

Disease

[edit]

The genus Asimina exists on only one continent, North America.[76] This gives the pawpaw a distinct advantage in the modern world of transcontinental commerce. In contrast to North American tree genera whose ranges extend into Europe or Asia (notably, chestnut and elm), global horticultural trade is therefore unlikely to introduce diseases that could decimate pawpaw.

As for native disease, the pawpaw fares very well. There are no known disease agents (including insects) that are especially damaging. Consequently, planting of pawpaw for landscaping or fruit production requires little to no attention to disease management.[77]

Habitat restoration

[edit]

Pawpaws are sometimes included in ecological restoration plantings, as they have many characteristics that make them ideal for repair of riparian ecosystems. The tree's fondness of wet soil and tendency to multiply clonally to form dense and well-rooted thickets can protect against erosion and runoff.[78] As a native species, pawpaw can be planted on river slopes for erosion control, as introduced species formerly used in the eastern United States for this purpose (such as bamboo and Amur honeysuckle) are now discouraged or prohibited because of their invasiveness. The nonexistent commercial demand of pawpaw timber also protects trees used for ecological reasons from potential future harvest.[78]

In the eastern United States, where large predators are almost entirely lacking, pawpaw is one of the few native subcanopy trees whose bark and leaves are too poisonous for deer to browse. It is therefore a viable species for forest understory restoration in areas where fragmented landscapes, dwellings, and parks status preclude hunting as a population control.[79][80]

Human uses

[edit]

Uses other than food

[edit]

The tough, fibrous inner bark of the pawpaw has traditionally been used by Native Americans and settlers in the Midwest for making ropes, fishing nets, and mats,[13][62] and for stringing fish.[15] Because the exotic emerald ash borer beetle is destroying black ash trees (Fraxinus nigra) in its native range, a basketmaker in Michigan whose ancestors traditionally used this northern species of ash has begun planting pawpaw seeds as a potential fiber replacement.[81] The planting is occurring several hundred miles north of pawpaw's historically native range, so it is an example of assisted migration of a plant in a time of rapid climate change.

Pawpaw logs have been used for split-rail fences in Arkansas.[13] The hard, brown, shiny lima-bean-sized seeds were sometimes carried as pocket pieces in Ohio.[13] Due to the presence of acetogenins, the leaves, twigs, and bark of pawpaw trees can be used to make an organic insecticide.[60]

Edible fruit

[edit]
A. triloba is often called wild banana, Indiana banana, or prairie banana because of its banana-like creamy texture and flavor.

The earliest documented mention of pawpaws is in the 1541 report of the Spanish de Soto expedition, who found Native Americans east of the Mississippi River cultivating what some have identified as the pawpaw.[82] The tree's scientific name (Asimina triloba) comes from the Powhatan word Assimina, which a Jamestown settler transcribed in 1612 as "wheat plum".[83] The Lewis and Clark Expedition consumed pawpaws during their travels.[82] Thomas Jefferson planted it at Monticello, his plantation in Virginia.[82] Legend has it that chilled pawpaw fruit was a favorite dessert of George Washington.[84]

Historically, the pawpaw was a commonly-eaten fruit throughout its native range. With the advent of motor travel and refrigeration, it has been used less commonly to the point of obscurity in favor of other commercial fruits. Despite its very short shelf life, vulnerability to bruising, and inability to fully ripen if harvested early, pawpaw has developed a specialty market appeal in some regions of its native range, including southern Ontario.[85]

As described by horticulturist Barbara Damrosch, the fruit of the pawpaw "looks a bit like mango, but with pale yellow, custardy, spoonable flesh and black, easy-to-remove seeds."[86] Wild-collected pawpaw fruits ripen in late August to mid-September through most of their range, but a month later near their northward limit.[87] They have long been a favorite treat throughout the tree's extensive native range in eastern North America, and on occasion are sold locally at farmers' markets.[3][86][87]

Pawpaw fruits have a sweet, custard-like flavor somewhat similar to banana, mango, and cantaloupe,[3][13] varying significantly by source or cultivar,[3] with more protein than most fruits.[3] Nineteenth-century American agronomist E. Lewis Sturtevant described pawpaws as "a natural custard, too luscious for the relish of most people."[62] Ohio botanist William B. Werthner wrote, "The fruit ... has a tangy wild-wood flavor peculiarly its own. It is sweet, yet rather cloying to the taste and a wee bit puckery – only a boy can eat more than one at a time."[13]

Fresh fruits of the pawpaw are commonly eaten raw, either chilled or at room temperature. However, they can be kept only 2–3 days at room temperature, or about a week if refrigerated.[26][88] This short shelf-life and difficulty shipping whole are a primary barrier to the success of pawpaw as a commercial fruit. The easily-bruised pawpaw fruits do not ship well unless frozen.[3][86] Where pawpaws grow, the fruit pulp is also used locally in baked dessert recipes, with pawpaw substituted with volumetric equivalency in many banana-based recipes. The sweet and creamy fruit is commonly mixed into ice cream[26] or blended into pancakes and other breads.[26]

Paw paw, raw with skin
Nutritional value per 100 g (3.5 oz)
18.8 g
Dietary fiber2.6 g
1.2 g
1.2 g
Vitamins and minerals
VitaminsQuantity
%DV†
Vitamin A equiv.
10%
87 μg
Thiamine (B1)
1%
0.01 mg
Riboflavin (B2)
7%
0.09 mg
Niacin (B3)
7%
1.1 mg
Vitamin C
20%
18.3 mg
MineralsQuantity
%DV†
Calcium
5%
63 mg
Iron
39%
7 mg
Magnesium
27%
113 mg
Manganese
113%
2.6 mg
Phosphorus
4%
47 mg
Potassium
12%
345 mg
Zinc
8%
0.9 mg
Analysis from Kentucky State University Pawpaw Program
†Percentages estimated using US recommendations for adults,[89] except for potassium, which is estimated based on expert recommendation from the National Academies.[90]

Nutrition

[edit]

According to a report from the KSU Pawpaw Program (right table), raw pawpaw (with skin) is 19% carbohydrates, 1% protein, 1% fat, and 79% water (estimated). In a reference amount of 100 g (3.5 oz), the raw fruit provides 80 calories, and is a rich source (20% or more of the Daily Value, DV) of vitamin C (20% DV), magnesium (27% DV), iron (39% DV), and manganese (113% DV). The fruit also contains a moderate amount of vitamin A (10% DV) and potassium (12% DV) (table).

Phytochemicals

[edit]

Pawpaw pulp contains phenolic acids and flavonols, particularly epicatechins and procyanidins.[91][92] Phytochemical extracts of the bark, leaves, twigs, and seeds contain acetogenins, including the neurotoxin annonacin, as well as other phytochemicals.[93][94][95]

Cultivars

[edit]

Over the years, a variety of cultivars of A. triloba have been developed or discovered,[96] although some have been lost and are no longer available commercially.[82][97][98] Most named cultivars derive from the northern parts of the species range.[67]

Kentucky State University (KSU) has a pawpaw research program[99] which seeks to develop methods and varieties to increase the viability of the pawpaw to be grown as a commercial fruit crop.

The named varieties producing large fruit and performing well in Kentucky per research trials are 'NC-1', 'Overleese', 'Potomac', 'Shenandoah', 'Sunflower', 'Susquehanna', 'Wabash', KSU-'Atwood', KSU-'Benson', and KSU-'Chappell'.[100]

Research

[edit]

Kentucky State University (KSU) has the only full-time pawpaw research program in the world; it was started in 1990 with the aim of developing pawpaw as a new tree-fruit crop for Kentucky. Pawpaw is the largest edible native fruit in North America and has very few diseases compared to other orchard crops. KSU is the site of the USDA National Clonal Germplasm Repository for Asimina species and the pawpaw orchards at KSU contain over 1,700 trees. Research activities include germplasm collection and variety trials, and efforts are directed towards improving propagation, understanding fruit ripening and storage, and developing orchard management practices. Cultivation is best in hardiness zones 5-9 and trees take 7–8 years from seedling to fruiting. KSU has created the three cultivars KSU-'Atwood', KSU-'Benson', and KSU-'Chappell', with foci on better flavors, higher yields, vigorous plants, and low seed-to-pulp ratios.[9][100][101][102][103]

Cultivation

[edit]
A row of pawpaw cultivars in a Michigan orchard. (A tall sugar maple and evergreen conifers in background.)

Cultivation is best in hardiness zones 5-9[9] and trees take 7–8 years from seedling to fruiting. Cross-pollination of at least two different genetic varieties of the plant is recommended.[3] Scholarly research is insufficient for horticulturalists to adopt best methods for attracting insect pollinators, as effective pollinators have not yet been distinguished from casual insect visitors.[41][43][44] Therefore, some growers resort to hand pollination or use pollinator attractants, such as spraying fish emulsion or hanging chicken necks or other meat near the open flowers to attract carrion-feeding beetles.[8][42]

Pawpaws have not been cultivated for their fruits on the scale of apples or peaches, primarily because pawpaw fruits ripen to the point of fermentation soon after they are picked, and only frozen fruit stores or ships well. Other methods of preservation include dehydration, production of jams or jellies, and pressure canning (using the numerical values for bananas). Methods of separating seeds from the pulp are still in the experimental phase. Mechanical methods are most efficient, but any splitting or injury of seeds can contaminate the remaining pulp with seed poisons.[104]

Commercial pawpaw production tends to be less intensive than other fruit trees.[105] Pawpaw requires very little pesticide/herbicide, even when planted as a monoculture. Because of its long taproot, pawpaw grows well even in drier upland plantings.[106] Cultivation of pawpaws for fruit production has attracted interest, particularly among organic growers, as a fruit with few to no pests that can successfully be grown in its native environment without pesticides. The commercial cultivation and harvesting of pawpaws is strongest in southeastern Ohio[107] and also being explored in Kentucky[3] and Maryland,[62] as well as various areas outside the species' native range, including California,[61] the Pacific Northwest,[61] and Massachusetts.[86] In New York state, due to climate change's impact on traditional fruit crops, such as apples and peaches, farmers are looking to pawpaw as a new commercial crop.[108]

Changing perspectives of the general population towards a healthier and environmentally conscious diet has led to increased interest in the pawpaw as food in recent years. Using pawpaw puree as a substitute for other sweeteners and creamers adds micronutrients such as iron and manganese while typically reducing the total sugar content as well as glycemic index of most recipes. If done correctly this will not negatively impact the quality of baked goods or desserts. In a study conducted using pawpaw puree in muffins, the pawpaw muffins were preferred in the blind taste test over the control (sugar) and other sweeteners (apple puree).[109] Frozen pawpaw pulp is used in ice cream and smoothies, and some craft brewers use the fruit in sour beers and meads.[108] The pawpaw is also used for landscaping due to its distinctive growth habit, the appeal of its fresh fruit, and its relatively low maintenance needs once established.[26]

As of 2024, global weather changes have led to the loss of many American apple and peach crops due to cold weather, making Pawpaw farming an increasingly favorable alternative because of its resilience to weather fluctuations.[110]

Propagation

[edit]
Pawpaw seeds require deep planting. Otherwise, the extending taproot will push the seed up above the soil (photo upper left).

Trees are easily grown from seed. Seeds should not be permitted to dry, as they lose viability if they dehydrate to 5% moisture.[111] The seeds need to be stratified by moist cold storage for 60–100 days at 35–45 °F (2–7 °C) (some publications suggest 90–120 days).[111][101][100] They will lose their viability if stored for three years or more; some seeds survive if stored for two years. Germination is hypogeal. This means that the cotyledons remain within the seed coat, acting as a food store for early growth until the plumule emerges from the soil on the epicotyl, or true stem. Because the large seeds contain enough energy to produce a long taproot prior to seeking photosynthetic opportunities above ground, the seed itself will be pushed upward and into the air if shallow planted in standard pots.

Given the 6 to 7 year maturity time and relatively poor success rates for dispersal and germination, it often requires 7 to 10 years for a sapling-to-sapling life cycle to occur for a given individual.[112]

Propagation using cuttings has generally not been successful.[111][101]

Desirable cultivars are propagated by chip budding or whip grafting onto a root stock. Pawpaw seeds do not grow "true to type" — each individual seed in a fruit is genetically different from the others and from its parent tree. Purchased cultivars do not produce seeds true to type, either, which is why cultivars are all grafted trees. Root sucker seedlings, however, are all genetically identical to their host.[101][100]

Commercial nurseries usually ship grafted cultivars in containers. Other nurseries, such as the Kentucky Division of Forestry, ship bareroot seedlings for reforestation projects and area homeowners.[113][100][114]

Harvesting small stems within a wild pawpaw patch is usually unsuccessful because most are clones of (and still connected to) adjacent stems and therefore lack fully developed roots.[101][100]

Cultural significance

[edit]

Old song

[edit]

A traditional American folk song portrays wild harvesting of pawpaws; Arty Schronce of the Georgia Department of Agriculture gives these lyrics:[26]

Where, oh where is dear little Nellie?
Where, oh where is dear little Nellie?
Where, oh where is dear little Nellie?
Way down yonder in the pawpaw patch

Pickin' up pawpaws, puttin' 'em in your pocket
Pickin' up pawpaws, puttin' 'em in your pocket
Pickin' up pawpaws, puttin' 'em in your pocket
Way down yonder in the pawpaw patch

He notes that "picking up pawpaws" refers to gathering the ripe, fallen fruit from beneath the trees, and that the "pocket" in the song is that of an apron or similar tie-on pocket, not a modern pants or blue-jeans pocket, into which pawpaws would hardly fit.[26] A "pawpaw patch" refers to the plant's characteristic patch-forming clonal growth habit.

Place names

[edit]

The pawpaw is the basis for various place and school names in the United States, almost all using the older spelling variant "paw paw".

Art

[edit]
Yellow-billed Cuckoo (Audubon), with a background of pawpaw foliage and fruits
  • Nineteenth-century naturalist and painter John James Audubon included pawpaw foliage and fruits in the background of his illustration of the yellow-billed cuckoo (Coccyzus americanus) in his classic work, The Birds of America (1827–1838).
  • Pawpaw fruits and a pawpaw leaf are featured in the painting Still Life with Pawpaws (circa 1870–1875) by Edward Edmondson, Jr. (1830–1884), at the Dayton Art Institute in Dayton, Ohio.
  • The Paw Paw is mentioned in the song "Bear Necessities" from the movie "The Jungle Book" : "Now when you pick a paw-paw or a prickly pear And you prick a raw paw, well, next time beware Don't pick the prickly pear by the paw When you pick a pear try to use the claw But you don't need to use the claw When you pick a pear of the big paw-paw Have I given you a clue?" However, neither pawpaws nor prickly pears are found in India, where the film takes place.

Other

[edit]
  • The third Thursday in September has been designated as National Pawpaw Day by the National Day Calendar.[121] It was announced on September 19, 2019,[122] at Kentucky State University's monthly sustainable agriculture workshop, the Third Thursday Thing.[123]
  • The pawpaw was designated as Ohio's state native fruit in 2009.[124]
  • Since 1999, the Ohio Pawpaw Growers' Association has sponsored an annual Ohio Pawpaw Festival at Lake Snowden, near Albany, Ohio.[125]
  • Since 2012, Delaware's Alapocas Run State Park has hosted an annual Pawpaw Folk Festival featuring tastings of the fruit.[126]
  • The larva of the Pawpaw sphinx moth feeds on pawpaw leaves.[127]
  • Since 2019, the pawpaw has been the official state fruit tree of Missouri.[128]
  • The endangered Missouri variety of French is known by outsiders and some native speakers as "Paw-Paw French."

References

[edit]
  1. ^ "Asimina triloba". The IUCN Red List of Threatened Species. 208. IUCN. e.T135958357A135958359. 2018. doi:10.2305/IUCN.UK.2018-2.RLTS.T135958357A135958359.en. S2CID 242070317.
  2. ^ "NatureServe Explorer 2.0". explorer.natureserve.org. Retrieved April 27, 2022.
  3. ^ a b c d e f g h i j k l m n Jones, Snake C.; Layne, Desmond R. (2019). "Pawpaw Description and Nutritional Information". Kentucky State University Cooperative Extension Program. Archived from the original on December 30, 2019. Retrieved December 30, 2019.
  4. ^ "Asimina triloba". College of Agriculture and Life Sciences, North Carolina State University. Archived from the original on April 6, 2018. Retrieved December 19, 2018.
  5. ^ Layne, DR (February 24, 1998). "Pawpaw". NewCrop Factsheet, Purdue University. Archived from the original on July 11, 2019. Retrieved December 19, 2018.
  6. ^ Huang, Hongwen; Layne, Desmond; Kubisiak, Thomas (July 2000). "RAPD Inheritance and Diversity in Pawpaw (Asimina triloba)". Journal of the American Society for Horticultural Science. 125 (4): 454–459. doi:10.21273/JASHS.125.4.454.
  7. ^ "Native Pawpaw Tree". North Carolina State University. September 6, 2017. Retrieved October 6, 2022.
  8. ^ a b c Pankau, Ryan (March 28, 2018). "Pawpaw". Illinois Extension Service. University of Illinois Urbana-Champaign. Retrieved October 6, 2022.
  9. ^ a b c Pomper, Kirk W.; Layne, Desmond R.; Peterson, R. Neal (1999). "The Pawpaw Regional Variety Trial". hort.purdue.edu. Archived from the original on April 14, 2015. Retrieved September 26, 2019.
  10. ^ Matthews, Elizabeth (September 21, 2021). "Pawpaw: Small Tree, Big Impact". U.S. National Park Service. Retrieved December 16, 2021.
  11. ^ Avalos, J; Rupprecht, J. K.; McLaughlin, J. L.; Rodriguez, E (1993). "Guinea pig maximization test of the bark extract from pawpaw, Asimina triloba (Annonaceae)". Contact Dermatitis. 29 (1): 33–5. doi:10.1111/j.1600-0536.1993.tb04533.x. PMID 8365150. S2CID 41590523.
  12. ^ Chamberlain, Alexander F. (December 1, 1902). "Algonkian Words in American English: A Study in the Contact of the White Man and the Indian". The Journal of American Folklore. 15 (59). American Folklore Society: 240–267. doi:10.2307/533199. ISSN 0021-8715. JSTOR 533199.
  13. ^ a b c d e f g h i j k l m n o Werthner, William B. (1935). Some American Trees: An intimate study of native Ohio trees. New York: The Macmillan Company. pp. xviii + 398 pp.
  14. ^ Chamberlain, Alexander F. (October 1902). "Algonkian Words in American English: A Study in the Contact of the White Man and the Indian". The Journal of American Folklore. 15 (59): 240–267. doi:10.2307/533199. ISSN 0021-8715. JSTOR 533199.
  15. ^ a b Sargent, Charles Sprague (1933). Manual of the trees of North America (exclusive of Mexico). Boston and New York: Houghton Mifflin Company: The Riverside Press Cambridge. pp. xxvi + 910.
  16. ^ Linnaeus, C. (1753). Species Plantarum. Holmiae: Impensis Laurentii Salvii. p. 1200.
  17. ^ Harper, Douglas. "papaya". Online Etymology Dictionary. Retrieved October 28, 2012.
  18. ^ CRC Press, 2004, p.122.
  19. ^ "The Asimoya". The Archives of the Rare Fruit Council of Australia. November 1, 1996. Archived from the original on March 29, 2018. Retrieved November 26, 2017.
  20. ^ Schweitzer, Ally (September 15, 2017). "This Once-Obscure Fruit Is On Its Way To Becoming PawPaw-Pawpular". NPR. Archived from the original on April 5, 2018. Retrieved April 4, 2018.
  21. ^ "American Indian Studies Research Institute". zia.aisri.indiana.edu. Archived from the original on December 13, 2018. Retrieved December 18, 2018.
  22. ^ "English to Kanza Dictionary" (PDF). kawnation.com. Archived (PDF) from the original on October 11, 2016. Retrieved December 18, 2018.
  23. ^ Byington, Cyrus (1915). A dictionary of the Choctaw language. Washington D.C.: United States Government Printing office. pp. 359. ISBN 1566321085. OCLC 53387982. Retrieved December 18, 2018.
  24. ^ a b c d e f g h i j k Keeler, Harriet L. (1900). Our Native Trees and How to Identify Them. New York: Charles Scribner's Sons. pp. 20–23. Retrieved November 7, 2019.
  25. ^ a b LaGrange, Renee L; Tramer, Elliot J (1985). "Geographic Variation in Size and Reproductive Success in the Paw Paw (Asimina triloba)" (PDF). Ohio Journal of Science. 85 (1): 40–45. S2CID 5658221. Retrieved July 15, 2024 – via The Ohio State University Libraries Knowledge Bank.
  26. ^ a b c d e f g Krewer, Gerard W.; Crocker, Thomas F.; Bertrand, Paul F.; Horton, Dan L. (February 20, 2015) [2012]. "Minor Fruits and Nuts in Georgia - Pawpaw, Bulletin 992". University of Georgia Cooperative Extension, College of Agricultural & Environmental Sciences, Athens, GA. Archived from the original on October 20, 2016. Retrieved October 19, 2016.
  27. ^ a b c Barlow, Connie (2001). The Ghosts of Evolution: Nonsensical Fruit, Missing Partners and Other Ecological Anachronisms. New York: Basic Books. pp. 51–69. ISBN 978-0-465-00551-2.
  28. ^ Walker JW (1971) Pollen Morphology, Phytogeography, and Phylogeny of the Annonaceae. Contributions from the Gray Herbarium of Harvard University, 202: 1-130.
  29. ^ Cantaluppi, C. J. (June 1, 2016). "The Pawpaw: An Emerging Specialty Crop". Journal of the NACAA. 9 (1). ISSN 2158-9429. Archived from the original on December 19, 2018. Retrieved December 19, 2018.
  30. ^ Simpson, Michael G (October 15, 2019). Plant Systematics. Amsterdam: Academic Press. ISBN 978-0-12-812628-8. OCLC 1322908222.
  31. ^ Kral, Robert (1997). "Annonaceae". Magnoliophyta: Magnoliidae and Hamamelidae. Flora of North America. Vol. 3. New York, NY: Oxford University Press. ISBN 978-0-19-511246-7.
  32. ^ "Asimina triloba (L.) Dunal". Plants Database, Natural Resources Conservation Service, US Department of Agriculture. 2017. Archived from the original on April 27, 2017. Retrieved May 23, 2017.
  33. ^ a b Tulowiecki, Stephen J (2021). "Modeling the geographic distribution of pawpaw (Asimina triloba [L.] Dunal) in a portion of its northern range limits, western New York State, USA". Plant Ecology. 222 (2): 193–208. Bibcode:2021PlEco.222..193T. doi:10.1007/s11258-020-01098-x. S2CID 228809757.
  34. ^ Horn, Charles N. (December 2015). "A New Hybrid of Asimina (Annonaceae) Based on Morphological and Ecological Data". Castanea. 80 (4): 262–272. doi:10.2179/15-067. ISSN 0008-7475. S2CID 85661787.
  35. ^ a b c Matthews, Elizabeth (September 21, 2021). "Pawpaw: Small Tree, Big Impact". National Park Service.
  36. ^ Goodrich, Katherine R; et al. (January 2006). "When Flowers Smell Fermented: The Chemistry and Ontogeny of Yeasty Floral Scent in Pawpaw (Asimina triloba: Annonaceae)". International Journal of Plant Sciences. 167 (1): 33–46. doi:10.1086/498351. S2CID 2309906.
  37. ^ Thein, Leonard B; Azuma, Hiroshi; Kawano, Shoichi (November 2000). "New Perspectives on the Pollination Biology of Basal Angiosperms". International Journal of Plant Sciences. 161 (S6): S225–S235. doi:10.1086/317575. S2CID 84852646.
  38. ^ Gottsberger, Gerhard; Silberbauer-Gottsberger, Ilse. "Basal Angiosperms and Beetle Pollination". XI congreso latinoamericano de botánica e LXV congresso nacional de botânica (2014). Retrieved March 31, 2022.
  39. ^ a b c d Barlow, Connie. "Pawpaw Ecological Survey in Michigan (with background information and excerpts of scholarly papers)". Torreya Guardians. Retrieved March 31, 2022.
  40. ^ Gottsberger, Gerhard (2008). "Pollination and Evolution in Neotropical Annonaceae". Plant Species Biology. 14 (2): 143–152. doi:10.1046/j.1442-1984.1999.00018.x.
  41. ^ a b c Saunders, Richard MK (2012). "The diversity and evolution of pollination systems in Annonaceae". Botanical Journal of the Linnean Society. 169: 222–244. doi:10.1111/j.1095-8339.2011.01208.x.
  42. ^ a b Moore, Andrew (2015). Pawpaw: In Search of America's Forgotten Fruit. Vermont: Chelsea Green. p. 4. ISBN 978-1-60358-596-5.
  43. ^ a b Kral, Robert (October 1960). "A Revision of Asimina and Deeringothamnus (Annonaceae)". Brittonia. 12 (4): 233–278. Bibcode:1960Britt..12..233K. doi:10.2307/2805119. JSTOR 2805119. S2CID 35766955.
  44. ^ a b Sayers, Thomas DJ; Steinbauer, Martin J; Miller, Rebecca E (April 2019). "Visitor or vector? The extent of rove beetle (Coleoptera: Staphylinidae) pollination and floral interactions". Arthropod-Plant Interactions. 13 (5): 685–701. Bibcode:2019APInt..13..685S. doi:10.1007/s11829-019-09698-9. S2CID 117745469.
  45. ^ "Pawpaw Factsheet". Clemson Cooperative Extension. Clemson University. Retrieved May 6, 2023.
  46. ^ a b Barlow, Connie (2001). "Anachronistic Fruits and the Ghosts Who Haunt Them" (PDF). Harvard University Arboretum. Archived (PDF) from the original on February 12, 2013. Retrieved December 5, 2012.
  47. ^ Janzen, Daniel H., and Paul S. Martin. "Neotropical anachronisms: the fruits the gomphotheres ate." Science 215, no. 4528 (1982): 19-27.
  48. ^ Cook, Robert E. "Attractions of the flesh." Natural History New York, NY 91, no. 1 (1982): 20-24.
  49. ^ Janzen, D. H.; Martin, P. S. (1982). "Neotropical Anachronisms: The Fruits the Gomphotheres Ate" (PDF). Science. 215 (4528). American Association for the Advancement of Science (AAAS): 19–27. Bibcode:1982Sci...215...19J. doi:10.1126/science.215.4528.19. ISSN 0036-8075. PMID 17790450. S2CID 19296719.
  50. ^ Abrams, Marc D; Nowacki, Gregory J (2008). "Native Americans as active and passive promoters of mast and fruit trees in the eastern USA" (PDF). The Holocene. 18 (7): 1123–1137. Bibcode:2008Holoc..18.1123A. doi:10.1177/0959683608095581. S2CID 128836416. Archived from the original (PDF) on December 19, 2017. Retrieved November 19, 2022.
  51. ^ Shipley, Jonathan (April 26, 2022). "The revival of a forgotten American fruit". BBC Travel. Retrieved April 28, 2022.
  52. ^ Wykoff, M William (March 2009). "On the Natural Distribution of Pawpaw in the Northeast" (PDF). The Nutshell: 23–32. Archived from the original (PDF) on April 1, 2022. Retrieved April 1, 2022.
  53. ^ a b Cuerrier, Alain. "Pawpaw". The Canadian Encyclopedia. Retrieved April 25, 2023.
  54. ^ Faber, Sarah W (October 6, 2022). "Pawpaws to the People!". Harvard Crimson.
  55. ^ Ruegsegger, Ted. "My Notes on Pawpaw". Retrieved May 1, 2023.
  56. ^ "Pawpaw tasting parties aim to educate on Zebra Swallowtail habitat restoration (2022)". Grow Pittsburgh. September 2022. Retrieved May 1, 2023.
  57. ^ a b c Marsden, Gabrielle. "Pittsburgh Pawpaw Pathways for Zebra Swallowtail Trails". Wild Ones: Western Pennsylvania Area Chapter. Archived from the original on May 1, 2023. Retrieved May 1, 2023.
  58. ^ Barlow, Connie. "Pawpaw, Asimina triloba, Habitat: Information for Choosing Sites for Wild-Planting Seeds". TorreyaGuardians. Retrieved May 1, 2023.
  59. ^ a b Asimina triloba Archived 2011-06-28 at the Wayback Machine, Fire Effects Information System, U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory
  60. ^ a b B. J. Sampson, J. L. McLaughlin, D. E. Wedge. 2003. PawPaw Extract as a Botanical Insecticide, 2002. Arthropod Management Tests, vol.28, p. L.
  61. ^ a b c d "Pawpaw". California Rare Fruit Growers. Archived from the original on July 20, 2011. Retrieved July 15, 2011.
  62. ^ a b c d e Bilton, Kathy. "Pawpaws: A paw for you and a paw for me". Archived from the original on July 18, 2011. Retrieved July 21, 2011.
  63. ^ Martin, John M.; Madigosky, Stephen R.; Gu, Zhe-ming; Zhou, Dawei; Wu, Jinn; McLaughlin, Jerry L. (January 1999). "Chemical defense in the zebra swallowtail butterfly, Eurytides marcellus, involving annonaceous acetogenins". Journal of Natural Products. 62 (1): 2–4. doi:10.1021/np980308s. PMID 9917274.
  64. ^ Marsden, Gabrielle (April 2021). "Plant native pawpaws to bring the butterflies back" (PDF). The Homepage - Hazelton Initiative. 11 (3): 16. Retrieved May 3, 2023.
  65. ^ "Editorial: The return of a long-lost butterfly (and a nearly forgotten fruit) to Pittsburgh". Pittsburgh Post-Gazette. September 23, 2024.
  66. ^ Ames, Guy K. (January 8, 2018). "Pawpaw – A "Tropical" Fruit for Temperate Climates". Small Farms Quarterly. Cornell Small Farms Program. Retrieved July 11, 2022.
  67. ^ a b Jones, Snake C; et al. "Pawpaw Planting Guide". kysu.edu. Kentucky State University Cooperative Extension Program. Retrieved April 29, 2023.
  68. ^ Hosaka, Naomi; Kachi, Naoki; Kudoh, Hiroshi; Stuefer, Josef F.; Whigham, Dennis F. (November 3, 2007). "Patch structure and ramet demography of the clonal tree, Asimina triloba, under gap and closed-canopy". Plant Ecology. 197 (2): 219–228. doi:10.1007/s11258-007-9372-z. ISSN 1385-0237. S2CID 7969684.
  69. ^ Miller, Kathryn M; McGill, Brian J (March 4, 2019). "Compounding human stressors cause major regeneration debt in over half of eastern US forests". Journal of Applied Ecology. 56 (6): 1355–1366. Bibcode:2019JApEc..56.1355M. doi:10.1111/1365-2664.13375. S2CID 92796991.
  70. ^ Kain, Morgan; Battaglia, Loretta; Royo, Alejandro; Carson, Walter P. (July 2011). "Over-browsing in Pennsylvania creates a depauperate forest dominated by an understory tree: Results from a 60-year-old deer exclosure". The Journal of the Torrey Botanical Society. 138 (3): 322–326. doi:10.3159/torrey-d-11-00018.1. ISSN 1095-5674. S2CID 85648031.
  71. ^ Slater, Mitchell; Anderson, Roger C.; Juliano, Steven A. (2022). "Does the photosynthetic response of Asimina triloba to low light contribute to its competitive advantage in forest understories compared with Acer saccharum and Fraxinus quadrangulata?". The Journal of the Torrey Botanical Society. 150 (2). doi:10.3159/TORREY-D-22-00003.1. S2CID 258815630.
  72. ^ Sipe, Timothy W (2023). "Light attenuation by pawpaw (Asimina triloba L.) in a midwestern upland forest". The Journal of the Torrey Botanical Society. 150 (2). doi:10.3159/TORREY-D-22-00016.1. S2CID 258811471.
  73. ^ "193.3 Protected native plants". Westlaw. Retrieved April 25, 2023.
  74. ^ "List of Endangered Plant Species and Plant Species of Concern (New Jersey)" (PDF). New Jersey Department of Environmental Protection. Retrieved April 25, 2023.
  75. ^ Slater, Mitchell A; Anderson, Rogers C (2014). "Intensive Selective Deer Browsing Favors Success of Asimina triloba (Paw Paw) a Native Tree Species". Natural Areas Journal. 34 (2): 178–187. doi:10.3375/043.034.0207. S2CID 52834948.
  76. ^ Little, Elbert (1978). Atlas of United States Trees. United States Department of Agriculture.
  77. ^ Jones, Snake C.; Layne, Desmond R. (1997). "Cooking with Pawpaws". Kentucky State University.
  78. ^ a b Robles-Diaz-de-Leon, Luisa Fernanda; Nava-Tudela, Alfredo (1998). "Playing with Asimina triloba (pawpaw): A species to consider when enhancing riparian forest buffer systems with non-timber products". Ecological Modelling. 112 (2–3): 169–193. Bibcode:1998EcMod.112..169F. doi:10.1016/S0304-3800(98)00078-7.
  79. ^ Miller, Kathryn M; et al. (March 2023). "Overabundant deer and invasive plants drive widespread regeneration debt in eastern United States national parks". Ecological Applications. 33 (4): e2837. Bibcode:2023EcoAp..33E2837M. doi:10.1002/eap.2837. PMID 36890590. S2CID 257425694.
  80. ^ Slater, Mitchell A; Anderson, Roger C (April 2014). "Intensive Selective Deer Browsing Favors Success of Asimina triloba (Paw Paw) a Native Tree Species" (PDF). Natural Areas Journal. 34 (2): 178–187. doi:10.3375/043.034.0207. S2CID 52834948.
  81. ^ House, Kelly (May 3, 2021). "As northern Michigan warms, scientists bring tree seedlings from the south". Michigan Bridge. Archived from the original on May 4, 2021. Retrieved July 21, 2021.
  82. ^ a b c d Moore, Andrew (2015). Pawpaw: In Search of America's Forgotten Fruit. White River Junction, Vermont: Chelsea Green Publishing. ISBN 9781603585965. Retrieved November 28, 2020.
  83. ^ "Way Down Yonder in the Paw-Paw Patch". Smithsonian Gardens. May 1, 2020. Retrieved June 19, 2022.
  84. ^ Ahuja, Akshay (September 10, 2015). "Rediscovering The Pawpaw". cincinnatimagazine.com. Archived from the original on October 12, 2016. Retrieved May 29, 2020.
  85. ^ Colley, Mark (October 15, 2024). "This fruit grows in Ontario, but it's nearly impossible to find. Inside the secretive world of the pawpaw hunters". Toronto Star. Retrieved November 7, 2024.
  86. ^ a b c d Damrosch, Barbara (September 8, 2011). "Return of the Native? Pawpaws' Proponents". The Washington Post (Local Living, p.9).
  87. ^ a b Kane, Roni (October 26, 2022). "'Nothing as dramatic as the pawpaw': Ann Arbor pawpaw farmer Marc Boone retraces memories through orchard". Michigan Daily.
  88. ^ "Locals explore the culinary potential of pawpaw". October 9, 2021.
  89. ^ United States Food and Drug Administration (2024). "Daily Value on the Nutrition and Supplement Facts Labels". FDA. Archived from the original on March 27, 2024. Retrieved March 28, 2024.
  90. ^ National Academies of Sciences, Engineering, and Medicine; Health and Medicine Division; Food and Nutrition Board; Committee to Review the Dietary Reference Intakes for Sodium and Potassium (2019). Oria, Maria; Harrison, Meghan; Stallings, Virginia A. (eds.). Dietary Reference Intakes for Sodium and Potassium. The National Academies Collection: Reports funded by National Institutes of Health. Washington, DC: National Academies Press (US). ISBN 978-0-309-48834-1. PMID 30844154. Archived from the original on May 9, 2024. Retrieved June 21, 2024.
  91. ^ Brannan, Robert G; et al. (February 2015). "Phytochemical analysis of ten varieties of pawpaw (Asimina triloba [L.] Dunal) fruit pulp". Food Chemistry. 158: 656–661. doi:10.1016/j.foodchem.2014.07.018. PMID 25172760.
  92. ^ Harris, Grant G; Brannan, Robert G (2009). "An Evaluation of Antioxidant Compounds, Reducing Potential, and Radical Scavenging of Pawpaw ( Asimina tribloba ) Fruit Pulp from Different Stages of Ripeness". Food Science and Technology. 42 (1): 275–279. doi:10.1016/j.lwt.2008.05.006.
  93. ^ Potts, L. F.; Luzzio, F. A.; Smith, S. C.; Hetman, M.; Champy, P.; Litvan, I. (2012). "Annonacin in Asimina triloba fruit: Implication for neurotoxicity" (PDF). NeuroToxicology. 33 (1): 53–8. Bibcode:2012NeuTx..33...53P. doi:10.1016/j.neuro.2011.10.009. PMID 22130466. Archived (PDF) from the original on October 5, 2016. Retrieved August 18, 2016.
  94. ^ Kim, Eun Jung; Suh, Kyung Mi; Kim, Dal Hwan; Jung, Eun Joo; Seo, Chang Seob; Son, Jong Keun; Woo, Mi Hee; McLaughlin, Jerry L. (February 2005). "Asimitrin and 4-hydroxytrilobin, new bioactive annonaceous acetogenins from the seeds of Asimina triloba possessing a bis-tetrahydrofuran ring". Journal of Natural Products. 68 (2): 194–197. doi:10.1021/np040184l. PMID 15730242.
  95. ^ Zhao, Geng-Xian; Miesbauer, Laura R.; Smith, David L.; McLaughlin, Jerry L. (June 1994). "Asimin, asiminacin, and asiminecin: novel highly cytotoxic asimicin isomers from Asimina triloba". Journal of Medicinal Chemistry. 37 (13): 1971–1976. doi:10.1021/jm00039a009. PMID 8027979.
  96. ^ "Sorten der Indianerbanane". Florians Pawpawschule - Asimina triloba (in German). Archived from the original on June 10, 2020. Retrieved June 10, 2020.
  97. ^ "Table 3. Pawpaw Cultivars". pawpaw.kysu.edu. Kentucky State University.
  98. ^ Pomper, Kirk W.; Crabtree, Sheri B.; Lowe, Jeremiah D. (January 21, 2009). "2009 Pawpaw Cultivars and Grafted Tree Sources". Kentucky State University. Archived from the original on September 22, 2019. Retrieved September 22, 2019.
  99. ^ Kentucky State University | Pawpaw
  100. ^ a b c d e f Kaiser, Cheryl; Ernst, Matt (July 2018). "Pawpaw" (PDF). University of Kentucky, College of Agriculture, Food and Environment, Cooperative Extension Service. Archived (PDF) from the original on July 15, 2019. Retrieved September 22, 2019.
  101. ^ a b c d e "Chapter: Propagation, The Pawpaw M. Brett Callaway. Originally published as a booklet in 1990 by Kentucky State University, edited and converted to web format in 1998 by Snake C. Jones". pawpaw.kysu.edu. Kentucky State University.
  102. ^ "USDA National Clonal Germplasm Repository for Asimina spp. at KSU, Slide 4". Kentucky State University. Archived from the original on September 26, 2019. Retrieved September 26, 2019.
  103. ^ "PawPaw". Kentucky State University. Archived from the original on September 21, 2019. Retrieved September 22, 2019.
  104. ^ Tran, Kevin; et al. (June 2021). "Annonacin and Squamocin Contents of Pawpaw (Asimina triloba) and Marolo (Annona crassiflora) Fruits and Atemoya (A. squamosa × A. cherimola) Seeds". Biological Trace Element Research. 199 (6): 2320–2329. Bibcode:2021BTER..199.2320T. doi:10.1007/s12011-020-02320-7. PMID 32761515. S2CID 220980817.
  105. ^ "Asimina triloba - Plant Finder". www.missouribotanicalgarden.org. Retrieved April 27, 2023.
  106. ^ Huang, Kuan-Ming; Guan, Zhengfei; Hammami, AbdelMalek (October 2022). "The U.S. Fresh Fruit and Vegetable Industry: An Overview of Production and Trade". Agriculture. 12 (10): 1719. doi:10.3390/agriculture12101719. ISSN 2077-0472.
  107. ^ "The 15th Annual Ohio Pawpaw Festival". Ohio Pawpaw Festival. Archived from the original on July 31, 2013. Retrieved August 9, 2013.
  108. ^ a b Phillips, Anna (October 18, 2024). "This American Fruit Could Outcompete Apples and Peaches on a Hotter Planet". The Washington Post. Retrieved October 18, 2024.
  109. ^ Templeton, Susan B.; Marlette, Martha; Pomper, Kirk W.; Jones, Snake C. (January 1, 2003). "Favorable Taste Ratings for Several Pawpaw Products". HortTechnology. 13 (3): 445–448. doi:10.21273/HORTTECH.13.3.0445. ISSN 1943-7714.
  110. ^ "This American fruit could outcompete apples and peaches on a hotter planet". Yahoo News. October 18, 2024. Retrieved October 20, 2024.
  111. ^ a b c "Propagation of Pawpaw (Asimina triloba)". International Plant Propagators' Society. Combined Proceedings of Annual Meetings. 2000. Retrieved May 17, 2016.
  112. ^ "Asimina triloba 'Sunflower' (Sunflower Pawpaw) | North Carolina Extension Gardener Plant Toolbox". plants.ces.ncsu.edu. Retrieved April 27, 2023.
  113. ^ "State Nurseries and Tree Seedlings - Kentucky Energy and Environment Cabinet". eec.ky.gov. Archived from the original on September 24, 2019. Retrieved September 22, 2019.
  114. ^ University of Kentucky Cooperative Extension Service. "Asimina triloba (Pawpaw)" (PDF). State of Kentucky. Retrieved April 27, 2023.
  115. ^ "Paw Paw Tunnel". Town of Paw Paw, West Virginia. Archived from the original on October 6, 2011. Retrieved July 15, 2011.
  116. ^ "RRHX - Railroad History Time Line - 1860". RRHX: Railroad History of Michigan. Archived from the original on July 23, 2011. Retrieved August 6, 2011.
  117. ^ Zeimetz, Lisa. "Stephen Wright House Archived 2019-09-21 at the Wayback Machine," (PDF), National Register of Historic Places Nomination Form, 1 April 2005, HAARGIS Database, Illinois Historic Preservation Agency. Retrieved September 21, 2019.
  118. ^ History of Miami County, Indiana: From the Earliest Time to the Present. Brant & Fuller. 1887. pp. 536. paw-paw.
  119. ^ Hess, Cameron M. Ludwick & Blair Thomas (March 30, 2015). My Old Kentucky Road Trip: Historic Destinations & Natural Wonders. Arcadia Publishing. p. 168. ISBN 978-1-62619-816-6.
  120. ^ "Sullivan County, Missouri Place Names, 1928-1945 | The State Historical Society of Missouri". collections.shsmo.org. Archived from the original on September 21, 2019. Retrieved September 21, 2019.
  121. ^ "NATIONAL PAWPAW DAY - Third Thursday in September". National Day Calendar. August 2, 2019. Archived from the original on September 21, 2019. Retrieved September 21, 2019.
  122. ^ "Third Thursday Thing Program". kysu.edu. Kentucky State University. Archived from the original on September 21, 2019. Retrieved September 21, 2019.
  123. ^ "The 'Third Thursday Thing': Eleven Years and Going Strong". kysu.edu. Kentucky State University. Archived from the original on September 21, 2019. Retrieved September 21, 2019.
  124. ^ Ohio Revised Code 5.082 Archived 2010-09-06 at the Wayback Machine
  125. ^ "Ohio Pawpaw Festival". ohiopawpawfest.com. Archived from the original on January 4, 2020. Retrieved May 11, 2020.
  126. ^ "Pawpaw Folk Festival set for Aug. 20 at the Blue Ball Barn". August 15, 2016. Archived from the original on December 2, 2016. Retrieved December 9, 2016.
  127. ^ Burke, Horace R.; Hodges, Ronald W. (July 23, 1971). "The Moths of America North of Mexico, including Greenland. Fascicle 21". The Southwestern Naturalist. 16 (1): 129. doi:10.2307/3670112. ISSN 0038-4909. JSTOR 3670112.
  128. ^ "Missouri Revisor of Statutes - Revised Statutes of Missouri, RSMo, Missouri Law, MO Law, Joint Committee on Legislative Research". revisor.mo.gov. Retrieved April 2, 2021.

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