Subfamily: Faboideae.
Phylogenetic Number: 3.10.43.
Tribe: Phaseoleae.
Subtribe: Glycininae.
Species Studied - Species in Genus: 10 studied; 10 in genus.
Fruit: A legume; unilocular; 2–6 cm long; 0.3–0.6 cm wide; 0.2–0.4 cm thick; 2–9 times longer than wide; with deciduous androecial sheath; without orifice formed by curving of fruit or fruit segments; straight to curved; not plicate; not twisted; asymmetrical, or symmetrical; linear, or falcate; with both sutures parallelly curved; not inflated; flattened 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, or long tapered at base; aligned with longitudinal axis of fruit; with the apex and base uniform in texture; coriaceous to chartaceous; seed chambers externally invisible, or visible (slightly); seed chambers with the raised seed chambers not torulose; margin not constricted; margin without sulcus; margin 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 twisting. Replum invisible. Epicarp dull; monochrome; tan to brown (dark); with surface texture uniform; pubescent and indurate; with hairs erect, or appressed; with 1 type of pubescence; puberulent, or tomentose; with pubescence golden, or gray; with pubescence uniformly distributed; with simple hairs; pliable; with hair bases plain; eglandular; without spines; smooth; not veined; not tuberculate; 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 to white; scurfy, or smooth, or cracked; without adhering pieces of testa; septate, or subseptate; with septa thin (tissue paper-like), flexible; with septa eglandular; chartaceous; not exfoliating; remaining fused to mesocarp and epicarp; without wings; entire. Seed(s) 3–14; length parallel with fruit length; neither overlapping nor touching; in 1 series. Funiculus of 1 length only; flattened; triangular. Aril present; dry; when dry rim-aril and tongue-aril; entire; brown to cream.
Seed: 2.7–5.2 mm long; 2–3.5 mm wide; 1.7–3 mm thick; not overgrown; angular, or not angular; symmetrical, or asymmetrical; oblong, or ovate, or rectangular, or reniform, or trapezoid; terete; with surface smooth; with visible radicle and cotyledon lobes, or without visible radicle and cotyledon lobes; without external groove between radicle and cotyledon lobes; with shallow hilar sinus, or without 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; dull; not modified by a bloom; colored; monochrome, or mottled; with frequent mottles; brown, or tan, or yellow; with black overlay; glabrous; smooth; chartaceous. Pleurogram absent. Pseudopleurogram absent. Fracture lines absent. Rim absent. Wing(s) absent. Raphe not visible. Hilum present; partially concealed, or fully concealed; concealed by aril; with faboid split, or without faboid split; with the lips of the faboid split the same color as the rest of the hilum; larger than punctiform; 0.5–1 mm long; with curved outline; circular, or elliptic, or oval; apical according to radicle tip but marginal according to seed length; flush; within corona; corona color lighter than testa, or darker than testa. Lens discernible; with margins straight, or curved; linear; elliptic; not in groove of raphe; confluent with hilum; flush; same color as testa, or similar color as testa; darker than testa; brown; within corona; corona color darker than testa. Endosperm present; thick to thin; not pluglike and not resembling tip of radicle; covering entire embryo; adnate to 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; not concealing radicle; entire over radicle; without lobes; with the interface division terminating at base of radicle; without margins recessed; white, or yellow, or tan; inner face flat; glabrous on inner face. Embryonic axis oblique to right angled; oblique to length of seed; without a joint evident between the radicle and the cotyledons. Radicle differentiated from cotyledon; bulbose; lobe tip curved; oblique to cotyledons; centered between cotyledons; less than 1/2 length of cotyledons. Plumule moderately developed; glabrous.