Subfamily: Mimosoideae.
Phylogenetic Number: 2.3.23.
Tribe: Mimoseae.
Group: Piptadenia.
Species Studied - Species in Genus: 3 studied; 10 in genus.
Fruit: A legume; unilocular; 8–13 cm long; 2–3 cm wide; 0.2–0.3 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 to curved; not plicate; not twisted; symmetrical; oblong; not inflated; flattened; without beak; rounded at apex; aligned with longitudinal axis of fruit; rounded at base; aligned with longitudinal axis of fruit; with the apex and base uniform in texture; coriaceous; seed chambers externally visible, or invisible; margin constricted; margin slightly constricted along both margins; margin without sulcus; margin plain, or embellished; margin with prickles; wing(s) absent; stipitate; with the stipe 5–7 mm long; indehiscent. Replum visible. Epicarp dull; monochrome; greenish to reddish tan; with surface texture uniform; glabrous; eglandular; without spines; not smooth; with elevated features; veined; reticulately veined; not tuberculate; exfoliating; without cracks; without embedded tissue, much thicker than epicarp, running from base to apex. Mesocarp absent. Endocarp present; visible; dull (separating into segments and from exocarp and sutures); opaque; monochrome; brown (darker in seed chamber); smooth; without adhering pieces of testa; septate; not exfoliating; separating from epicarp; separating into 1-seeded winged segments (falling free from replum). Seed(s) 12–14; length oblique to fruit length; neither overlapping nor touching; in 1 series. Funiculus to 10 mm long; of 1 length only; filiform; plicate. Aril absent.
Seed: 7 mm long; 5.5 mm wide; 1.5 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; glabrous; smooth; coriaceous. Pleurogram present; 90 %. Pseudopleurogram absent. Fracture lines absent. Rim absent. Wing(s) absent. Raphe not visible. Hilum present; fully concealed; concealed by funicular remnant; without faboid split; punctiform; subapical to radicle tip; flush; not within corona, halo, or rim. Lens not discernible. Endosperm present; thin; not pluglike and not resembling tip of radicle; adnate to testa. Cotyledons smooth; both outer faces flat; 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; with lobes touching (auriculate); with the interface division terminating at base of radicle; with margin(s) 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; straight with embryonic axis; centered between cotyledons; less than 1/2 length of cotyledons. Plumule rudimentary; glabrous.
Southern Mexico, Central America, Brazilian and Peruvian Amazon, the Guianas, and tropical and southern Africa.
New World and Old World; southern Mexico, Central America, and South America (Brazilian and Peruvian Amazon, the Guianas); tropical and soythern Africa.