Subfamily: Faboideae.
Phylogenetic Number: 3.10.19.
Tribe: Phaseoleae.
Subtribe: Diocleinae.
Species Studied - Species in Genus: 1 studied; 1 in genus.
Fruit: A legume; unilocular; 4.4–6 cm long; 1.8–2.2 cm wide; 0.4–0.7 cm thick; 2–9 times longer than wide; with deciduous androecial sheath; with deciduous corolla; with deciduous calyx; without orifice formed by curving of fruit or fruit segments; slightly curved; not plicate; not twisted; asymmetrical, or symmetrical; oblong, or falcate; with both sutures parallelly curved; not inflated; compressed; with beak; declined; with solid beak the same color and texture as fruit; short tapered at apex; oblique with longitudinal axis of fruit; rounded at base, or short tapered at base; oblique with longitudinal axis of fruit; with the apex and base uniform in texture; coriaceous; seed chambers externally invisible; margin constricted, or not constricted; margin slightly constricted only on 1 margin; margin without sulcus; margin embellished; margin with ridge(s); 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; brown; with surface texture uniform; pubescent and indurate; with hairs erect; with 1 type of pubescence; sericeous; with pubescence golden; with pubescence uniformly distributed; with simple hairs; pliable; with hair bases plain; eglandular; without spines; smooth; not veined; not tuberculate; not exfoliating; with cracks; cracking oblique to fruit length; without embedded tissue, much thicker than epicarp, running from base to apex. Mesocarp present; thin; surface not veined; 2-layered; without balsamic vesicles; with fibers; without reniform canals; with fibers over solid layer (resembling tomentose layer where endocarp exfoliates); coriaceous. Endocarp present; visible; dull; opaque; monochrome; brown; smooth; without adhering pieces of testa; septate; with septa thin (tissue paper-like), flexible; with septa eglandular; chartaceous; exfoliating in part; remaining fused to mesocarp and epicarp; without wings; entire. Seed(s) 2–5; length transverse to fruit length; neither overlapping nor touching; in 1 series. Funiculus 10–15 mm long; of 1 length only; flattened; triangular. Aril present; dry; when dry rim-aril; crenate; covering less than 1/2 of seed; without tongue (or flap) on lips of 2-lipped rim-aril; tan.
Seed: 10–14 mm long; 6–8.5 mm wide; 4–5.6 mm thick; not overgrown; not angular; symmetrical; oblong to ovate, or reniform; compressed; with surface smooth; without visible radicle and cotyledon lobes; 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; glossy; not modified by a bloom; colored; monochrome; dark brown; glabrous; smooth; coriaceous. Pleurogram absent. Pseudopleurogram absent. Fracture lines present; concentric. Rim absent. Wing(s) absent. Raphe not visible. Hilum present; visible; with faboid split; with the lips of the faboid split the same color as the rest of the hilum; larger than punctiform; 13–13.2 mm long; with straight outline; linear; marginal according to radicle tip; raised; within rim; rim color darker than testa. Lens discernible; 0.5–0.8 mm long; with margins straight; linear; not in groove of raphe; confluent with hilum; flush; same color as testa; dark brown; not within corona, halo, or rim. Endosperm present; trace; not pluglike and not resembling tip of radicle; restricted to region of embryo; adnate to testa. 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; without margins recessed; tan; inner face flat; glabrous on inner face. Embryonic axis oblique; oblique to length of seed; without a joint evident between the radicle and the cotyledons. Radicle differentiated from cotyledon; triangular; lobe tip straight; oblique to cotyledons; centered between cotyledons; less than 1/2 length of cotyledons. Plumule moderately developed; glabrous.