Subfamily: Caesalpinioideae.
Phylogenetic Number: 1.1.13.
Tribe: Caesalpinieae.
Group: Peltophorum.
Species Studied - Species in Genus: 2 studied; 3 in genus.
Fruit: A legume; unilocular; 9–59 cm long; 3.5–8 cm wide; 0.5–2 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; symmetrical, or asymmetrical; oblong, or falcate; with both sutures parallelly curved; not inflated; flattened; without beak; long tapered at apex to tapered at apex; aligned with longitudinal axis of fruit; short tapered 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 twisting (?). Replum invisible. Epicarp glossy; monochrome; brown (dark); with surface texture uniform; glabrous; eglandular; without spines; smooth, or not smooth; with elevated features; 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; 1-layered (?); without balsamic vesicles; oblique with fibers; without reniform canals; solid; ligneous. Endocarp present; visible; dull; opaque; monochrome; brown (dark reddish); without adhering pieces of testa; nonseptate; not exfoliating; remaining fused to mesocarp and epicarp; entire. Seed(s) at least 4; length parallel with fruit length and transverse to fruit length; neither overlapping nor touching; in 1 series. Funiculus 1.5 mm long; of 1 length only; thick; straight to curved. Aril absent.
Seed: 40–60 mm long; 40–60 mm wide; 6–10 mm thick; not overgrown; angular, or not angular; symmetrical; oblong, or rectangular, or circular; flattened; 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 (dark to reddish); glabrous; not smooth; with elevated features, or recessed features; rugose; pitted with small separate pits; chartaceous. Pleurogram absent. Pseudopleurogram absent. Fracture lines absent. Rim absent. Wing(s) present. Raphe not visible. Hilum present; visible; without faboid split; punctiform; apical according to radicle tip but marginal according to seed length; recessed; 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; with lobes (lobes overtopping exposed radicle and joined to radicle at right angles to plane of compression - unlike other caesalpinoids); with lobes not touching; 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.