Subfamily: Caesalpinioideae.
Phylogenetic Number: 1.4.70.
Tribe: Detarieae.
Group: Macrolobium.
Species Studied - Species in Genus: 1 studied; 1 in genus.
Fruit: A legume; unilocular; 8.5–19(–20) cm long; 2.5–6 cm wide; 0.9–1.5 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; straight; not plicate; not twisted; asymmetrical; oblong; not inflated; flattened; without beak; tapered at apex; oblique with longitudinal axis of fruit; rounded at base; oblique with longitudinal axis of fruit to right angled with longitudinal axis of fruit; with the apex and base uniform in texture; ligneous; seed chambers externally faintly to clearly visible; margin not constricted; margin without sulcus; margin embellished; margin with thickened sutural areas (along the ventral margin); wing(s) absent; stipitate; with the stipe 6–15 mm long; with all layers dehiscing; splitting along suture(s). Dehiscence of valves along both sutures (initially along the ventral margin). Replum invisible. Epicarp dull; monochrome; dark reddish brown; with surface texture uniform; glabrous; eglandular; without spines; not smooth; with elevated features; veined, or not veined; obliquely veined relative to fruit length; not tuberculate; not exfoliating; without cracks; without embedded tissue, much thicker than epicarp, running from base to apex. Mesocarp present; surface not veined; 2-layered; without balsamic vesicles; with fibers; without reniform canals; with fibers oblique over solid layer; ligneous. Endocarp present; visible; dull; opaque; monochrome; dark reddish brown; without adhering pieces of testa; septate; not exfoliating; remaining fused to mesocarp and epicarp; entire. Seed(s) 6–7; length transverse to fruit length; neither overlapping nor touching; in 1 series. Funiculus 0.1–4 mm long; of 1 length only; thick; straight. Aril absent.
Seed:13–25 mm long; 10–20 mm wide; 9–10 mm thick; not overgrown; angular; symmetrical; quadrangular; 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; not smooth; with elevated features; shagreen; osseous. Pleurogram absent. Pseudopleurogram present (areola sunken compared to seed margin); 100 %. Fracture lines present; fracture line pattern not specified, in areola and raphe from hilar to basal lens. Rim absent. Wing(s) absent. Raphe visible. Hilum present; visible; without faboid split; punctiform; apical at apex of radicle tip; flush; not within corona, halo, or rim. Lens discernible; 0.1–5 mm long; with margins curved; elliptic; not in groove of raphe; mounded; same color as testa; not within corona, halo, or rim. Endosperm absent. 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; completely concealing radicle; barely notched at radicle; with the interface division terminating at base of radicle; without margins recessed; inner face flat; glabrous on inner face. Embryonic axis straight; parallel to length of seed; without a joint evident between the radicle and the cotyledons. Radicle differentiated from cotyledon; centered between cotyledons. Plumule rudimentary; glabrous.