English: Classification of legume root nodules based on morphology (names of legume genera exhibiting this morphology are provided in parentheses):
Determinate:
- A. globose (Glycine, Vigna, Erythrina, Sesbania)
- B. aeschynomenoid/dalbergioid (Aeschynemone, Arachis, Dalbergia)
Indeterminate:
- C. elongate (Albizia, Tephrosia, Vicia)
- D. bifurcate (Leucaena, Medicago)
- E. palmate (Acacia, Crotalaria)
- F. coralloid (Albizia moluccana)
- G. perennial branched clusters (Swartzia trinitensis)
- H. perennial globose—apical (Wisteria sinensis), shown here at 1, 2, and 4 years
- I. lupinoid (Lupinus, Listia)
Based on:
- Allen ON, Allen EK. (1981) The Leguminosae: A Source Book of Characteristics, Uses, and Nodulation. Madison, WI: The University of Wisconsin Press, pp. lii–liii. ISBN 0-299-08400-0
- Sprent JI. (2007) "Tansley Review: Evolving ideas of legume evolution and diversity: a taxonomic perspective on the occurrence of nodulation." New Phytol 174 (1): 11–25 doi:10.1111/j.1469-8137.2007.02015.x
- Sprent JI, James EK. (2007) "Legume Evolution: Where Do Nodules and Mycorrhizas Fit In?" Plant Physiol 144 (2): 575–581 doi:10.1104/pp.107.096156
- Sprent JI, Ardley JK, James EK. (2013) "From North to South: A latitudinal look at legume nodulation processes." S Afr J Bot 89: 31–41 doi:10.1016/j.sajb.2013.06.011