Oemleria

Oemleria Temporal range: Eocene - recent[1] PreꞒ Ꞓ O S D C P T J K Pg N
Conservation status
Least Concern  (IUCN 3.1)[2]
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Rosids
Order:	Rosales
Family:	Rosaceae
Subfamily:	Amygdaloideae
Tribe:	Exochordeae
Genus:	Oemleria Rchb.
Species:	O. cerasiformis
Binomial name
Oemleria cerasiformis (Torr. & Gray ex Hook. & Arn.) J.W.Landon
Synonyms[3][4][5]
Nuttallia cerasiformis Torr. & A. Gray ex Hook. & Arn. Osmaronia cerasiformis (Torr. & A. Gray ex Hook. & Arn.) Greene

Oemleria cerasiformis, a shrub commonly known as osoberry,^[6] Squaw plum,^[7] or Indian plum,^[8] is the sole extant species in genus Oemleria.

Native to the Pacific coast and ranges of North America, from British Columbia, Canada to Santa Barbara County, California, U.S.A.,^[8] it is among the first plants to leaf out and flowers early in the spring. It reaches a height of 1.5–5 m and has lance-shaped leaves 5–12 cm long.

The fruits of osoberry are edible and resemble small plums which are dark blue when ripe.^[9] Indigenous peoples of the Americas include osoberry in their diets, make tea of the bark, and chew its twigs to use as a mild anesthetic and aphrodisiac.^[10]

One other fossil species is known from the genus: Oemleria janhartfordae from the Eocene Klondike Mountain Formation.^[11]

Osoberry is an erect, loosely branched shrub reaching 15 feet (4.6 m) in height. Leaves are alternate, simple, deciduous; generally elliptical or oblong, 2–5 inches (5.1–12.7 cm), light green and smooth above and paler below with very small soft hairs; margins are entire to wavy; fresh foliage smells and may taste like cucumber. Among the first plants to leaf-out in the spring. The plants are dioecious;^[12] male and female flowers occur on different plants. The five-petaled flowers are white or whitish-green, pendulous, about one centimetre (0.39 in) across, and often appear in late winter before the leaves. The bitter-tasting fruit occurs in ovoid drupes up to 0.5 inches (1.3 cm) long, orange or yellow when young but blue-black when mature; borne on a red stem. The twig is slender, green turning to reddish brown, pith chambered, conspicuous orange lenticles. Bark is smooth, reddish brown to dark gray.^[12]

Indian Plum is "shrubby"—often with multiple trunks and horizontal growth. Sagging branches that touch the ground root readily and separate, so large trees are often surrounded by genetic clones.^{[citation needed]}

The wood is exceptionally strong and fine grained. With stems generally less than two inches [5 cm] in diameter, this small size limits the size of products that can be made from it. The fairly common straight shoots make fine primitive arrows and the rare, large enough and straight stem can be fashioned into an excellent self bow. It is also suitable for small wooden tools such as spoons, combs, knitting needles, etc. The fine grain and lack of significant figure also make the wood well suited for fine detail carving.

The Pacific coast tribes utilized its fruit, twigs, and bark, as food sources and for teas and medicine.^[13] It is one of the first tree-borne fruits to ripen in summer and as such was prized by indigenous peoples and wildlife alike. Fruiting is highly variable, with sunny locations producing more, as well as larger and sweeter fruits. The fruits can be eaten raw, or cooked when bitter; they tend to be somewhat astringent.^[13]

• 
  Fruits of O. cerasiformis
• 
  An Indian plum shrub as its leaves begin to yellow in mid-summer, Pierce County, Washington

• Media related to Oemleria at Wikimedia Commons
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