Subfamily: Caesalpinioideae.
Phylogenetic Number: 1.4.15.
Tribe: Detarieae.
Group: Hymenostegia.
Species Studied - Species in Genus: 1 studied; 1 in genus.
Fruit: A legume; unilocular; 15–22 cm long; 3.5–4.5 cm wide; 0.5 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; curved; not plicate; not twisted; asymmetrical; oblanceolate to oblong; not inflated; flattened; without beak; rounded at apex (bearing stylar base); aligned with longitudinal axis of fruit; rounded at base; aligned with longitudinal axis of fruit; with the apex and base uniform in texture; ligneous; seed chambers externally invisible; margin not constricted; margin without sulcus; margin plain; wing(s) absent; substipitate; with all layers dehiscing; splitting along suture(s). Dehiscence of valves along both sutures; active; with valves separately enrolling. Replum invisible. Epicarp dull; monochrome; brown; with surface texture uniform; glabrous; eglandular; without spines; not smooth; with elevated features; faintly veined; transversely 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 reticulate embedded in mealy tissue over solid layer; ligneous. Endocarp present; visible; dull; opaque; monochrome; brown; smooth; without adhering pieces of testa; subseptate; not exfoliating; remaining fused to mesocarp and epicarp; entire. Seed(s) 10; length transverse to fruit length to oblique to fruit length; neither overlapping nor touching; in 1 series. Funiculus 0.1–2 mm long; of 1 length only; flattened; straight. Aril present; dry; when dry caplike; entire; covering less than 1/2 of seed; brown (nearly color of testa).
Seed: 19–22 mm long; 13–16 mm wide; 4–5 mm thick; not overgrown; not angular; symmetrical; oblong; 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; brown (usually darker along margins and yellowish brown on faces); glabrous; smooth; osseous. Pleurogram absent. Pseudopleurogram present; 100 %. Fracture lines present; concentric. Rim absent. Wing(s) absent. Raphe visible (upon removal of cuticle a whitish raphe is visible from hilum to base of seed). Hilum present; fully concealed; concealed by aril; without faboid split; punctiform; subapical to radicle tip; flush (in depression); not within corona, halo, or rim. Lens not discernible. 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; partially concealing radicle (only tip exposed); split over radicle and 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.