Benth., Trans. Linn. Soc. London 30:599. 1875
Mimosa wilsonii Standl. Jarina
Tree, to 25 m tall; trunk weakly buttressed, to 45 cm dbh; outer bark unfissured, rough, hard, thin; inner bark reddish-brown, granular; young branches, petioles, rachises, and pinnular rachises rufous-tomentose; sap with an indistinct odor. Leaves bipinnate with 10-25 pairs of opposite pinnae; petioles 1.5-3 cm long, swollen basally, bearing a small, sessile gland ca 0.5 mm wide just above the pulvinus; stipules minute, caducous; rachis to 25 cm long, ridged along the center of the upper surface, with a similar gland at each node; pinnular rachis 4-10 cm long with 1 to several glands at terminal nodes; leaflets in 50-70 pairs per pinna, linear-oblong, less than 5 mm long and 0.8 mm wide, glabrous above, rufous-puberulent below, the midrib eccentric. Inflorescences rufous-tomentulose, axillary, in groups of 3-8; peduncles 1-4 cm long; heads short-spicate, appearing globular with the axis ca 2.5 mm long; bracts miniscule; flowers sessile to subsessile, green with white anthers; calyx turbinate, ca 2.5 mm long, the teeth 5, obtuse to acute, ca 1 mm long; corolla 2.5-5 mm long, the 5 segments acute, densely sericeous outside, glabrous inside; stamens 10, to 10 mm long, united at base into a short tube (if the tube extends nearly the entire length of the stamens, the stamens reduced to staminodia). Legumes reniform, 2-2.5 cm wide, curved into an overlapping circle to 5 cm diam, flat, reddish-brown, glabrous; seeds ellipsoid-to triangular-compressed, 6-8 mm long, smooth, brown, ringed on the largest circumference with a lighter area. Croat 14986, Wilson 130, Woodworth & Vestal 688.
Rare; a large tree grows at Miller Trail 875. Flowers in the dry season (February to April). The fruits mature from April to May (or later).
Mexico and Guatemala to Brazil. In Panama, scattered and possibly cultivated; known from tropical moist forest in the Canal Zone and Panama, from premontane wet forest in Chiriqui, and from tropical wet forest in Panama.