Uncaria tomentosa Dc.

veins and venules, the intervenal areas patulous reticulate; petioles to 1.5 cm long, 0.1-0.35 cm wide, tomentose; the stipules triangular, ca. 1 cm long, ca. 1.2 cm wide at base, acute, stiff, drying rubescent, with appressed white hairs. In-florescences axillary, to 9 cm long, the peduncles 1.0-3.5 cm long, 0.8-3.0 mm wide, simply terminating in a globose capitulum of flowers, or the axes with 2 pairs of branches, these opposite, perpendicular, well spaced, puberulent, each terminated by a rotund capitulum, ca. 2 cm in diam. Flowers yellowish; hypan-thium oblong, to 1.5 mm long, carnose, puberulent, the calycine cup urceolate, ca. 0.65 mm long, densely white villose within, pubescent outside, the 5 teeth disposed as points; corolla with the tube funneliform, ca. 5 mm long, ca. 0.6 mm wide, petaloid, puberulent inside and out, the lobes 5, reflexed, oblong rotund, 1.4-1.7 mm long, glabrous on the adaxial face; stamens 5, the anthers oblong, 1.1-1.5 mm long, sessile, attached near the mouth; ovary 2-loculate, the septum moderately thin, the style linear, far exserted, ca. 4.5-6.0 mm long, the stigmas clavate, 1.0-1.5 mm long. Fruits septicidally bivalvate, narrowly ovate oblong, to 6 mm long, the persistent calyx coroniform, ca. 1 mm long and wide, drying tan, vaguely longitudinally striate, covered with dense white hairs, the seeds linear fusiform, to 4 mm long, the body ca. 1 mm long, the wing narrower than the body, membranous, 1 end linear oblong, the other deeply cleft and biaristate.

Typical of primary forest, but also found in disturbed forest and rarely in secondary forest.

Can be grown by cuttings or seedlings.