Subfamily: Faboideae.
Phylogenetic Number: 3.10.42.
Tribe: Phaseoleae.
Subtribe: Glycininae.
Species Studied - Species in Genus: 4 studied; 8 in genus.
Fruit: A legume; unilocular; 1.3–2.9 cm long; 0.7–0.8 cm wide; 0.4–0.5 cm thick; length less than twice as long as width to 2–9 times longer than wide; with persistent androecial sheath; with deciduous corolla; with persistent calyx; with calyx shorter than fruit; without orifice formed by curving of fruit or fruit segments; straight; not plicate; not twisted; asymmetrical, or symmetrical; moniliform; with both sutures parallelly curved; not inflated; compressed to terete; with beak (short); declined; with solid beak the same color and texture as fruit; short tapered at apex; aligned with longitudinal axis of fruit; tapered at base; aligned with longitudinal axis of fruit; with the apex and base uniform in texture; chartaceous; seed chambers externally visible; seed chambers with the raised seed chambers not torulose; margin constricted; margin constricted along both margins; margin without sulcus; margin plain, or embellished; margin with thickened sutural areas; wing(s) absent; nonstipitate; with all layers dehiscing; splitting along suture(s). Dehiscence of valves along both sutures; apical and down; active; with valves reflexing. Replum invisible. Epicarp dull; monochrome; dark brown to tan; with surface texture uniform; pubescent and indurate, or pubescent but soon deciduous; with hairs erect; with 1 type of pubescence; pilose, or sericeous; with pubescence golden; with pubescence uniformly distributed; with simple hairs; pliable; with hair bases plain; eglandular; without spines; smooth, or not smooth; veined; irregularly veined; not tuberculate; not exfoliating; without cracks; without embedded tissue, much thicker than epicarp, running from base to apex. Mesocarp present; thin; surface not veined; 1-layered; without balsamic vesicles; without reniform canals; solid; chartaceous. Endocarp present; visible; dull; opaque; monochrome; tan; smooth; without adhering pieces of testa; nonseptate; chartaceous; not exfoliating; remaining fused to mesocarp and epicarp; without wings; entire. Seed(s) 1–3; length parallel with fruit length; neither overlapping nor touching; in 1 series. Funiculus 0.5–0.7 mm long; of 1 length only; flattened; triangular. Aril present; dry; when dry rim-aril and tongue-aril, or rim-aril; entire; brown.
Seed: 6.5–7.5 mm long; 5–6.3 mm wide; 4.5–6 mm thick; not overgrown; not angular; symmetrical; elliptic, or ovate; terete; with surface smooth; without visible radicle and cotyledon lobes; with shallow hilar sinus; without umbo on seed faces; without medial ridge on each face. Cuticle not exfoliating; not inflated; not wrinkled. Testa present; without pieces of adhering epicarp; not adhering to endocarp; free from endocarp; glaucous; modified by a bloom; colored; monochrome; black to brown (dark); glabrous; smooth; coriaceous. Pleurogram absent. Pseudopleurogram absent. Fracture lines absent. Rim absent. Wing(s) absent. Raphe visible, or not visible; from hilum to near base of seed and terminating; not bifurcating; color of testa, or lighter than testa; black, or brown; recessed. Hilum present; partially concealed; concealed by aril; with faboid split; with the lips of the faboid split the same color as the rest of the hilum; larger than punctiform; 1–2.2 mm long; with curved outline; elliptic; marginal according to radicle tip; recessed; within rim; rim color of testa, or darker than testa. Lens discernible; 0.5–1 mm long; with margins straight; linear; not in groove of raphe; confluent with hilum; flush; same color as testa; black, or brown; within corona, or not within corona, halo, or rim; corona color darker than testa. Endosperm present; thin, or trace; not pluglike and not resembling tip of radicle; covering entire embryo, or restricted to region of embryo; adnate to testa, or embryo. Cotyledons smooth; both outer faces convex; both the same thickness; both more or less of equal length; not folded; margin entire 180 degrees from base of radicle; similar at apex; partially concealing radicle; split over radicle; without lobes; with the interface division terminating at base of radicle; with margin(s) recessed; with 1 margin recessed; recessed on same side as radicle; white, or tan; inner face concave; glabrous on inner face. Embryonic axis right angled; perpendicular to length of seed; without a joint evident between the radicle and the cotyledons. Radicle differentiated from cotyledon; triangular; lobe tip curved; oblique to cotyledons; centered between cotyledons; less than 1/2 length of cotyledons. Plumule rudimentary; glabrous.