Subfamily: Caesalpinioideae.
Phylogenetic Number: 1.4.73.
Tribe: Detarieae.
Group: Amherstia.
Species Studied - Species in Genus: 2 studied; 5 in genus (F.R. Rickson, pers. comm. 1999).
Fruit: A legume; unilocular; 5–12 cm long; 2–4.5 cm wide; ?; 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 to curved; not plicate; not twisted; symmetrical, or asymmetrical; oblong, or falcate; with both sutures parallelly curved, or 1 straight and 1 curved suture; widest near middle or D-shaped, or widest near apex; not inflated; compressed; without beak; long tapered at apex; aligned with longitudinal axis of fruit to oblique with longitudinal axis of fruit; tapered at base; aligned with longitudinal axis of fruit to oblique with longitudinal axis of fruit; with the apex and base uniform in texture; coriaceous; 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 to reddish brown; with surface texture uniform; glabrous to pubescent and indurate (velvety); with hairs erect; with simple hairs; eglandular; without spines; not smooth; with elevated features; 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; 1-layered; without balsamic vesicles; without fibers; without reniform canals; solid; coriaceous. Endocarp present; visible; dull; opaque; monochrome; tan; without adhering pieces of testa; nonseptate; not exfoliating; remaining fused to mesocarp and epicarp; entire. Seed(s) 2–6; length transverse to fruit length; neither overlapping nor touching; in 1 series. Funiculus 1.1–2 mm long; of 1 length only; thick; straight. Aril absent.
Seed: 14–20 mm long; 10–15 mm wide; 3–4 mm thick; not overgrown; not angular; symmetrical; ovate to 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; nearly glossy; not modified by a bloom; colored; monochrome; reddish brown; glabrous; not smooth; with elevated features; rugose; chartaceous. Pleurogram absent. Pseudopleurogram absent. Fracture lines absent. Rim absent. Wing(s) absent. Raphe not visible. Hilum present; fully concealed; concealed by funicular remnant; without faboid split; larger than punctiform; 0.1–1.5 mm long; shape not specified; apical at apex of radicle tip; flush; 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); notched at radicle and split over 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 to oblique to length of seed (slightly); without a joint evident between the radicle and the cotyledons. Radicle differentiated from cotyledon; centered between cotyledons. Plumule rudimentary; glabrous.