Monographs Details: Ptychopetalum uncinatum Anselmino
Authority: Sleumer, Hermann O. 1984. Olacaceae. Fl. Neotrop. Monogr. 38: 1-159. (Published by NYBG Press)
Description:Species Description - Tree to 12 m high; trunk slender. Branchlets subcylindric, striate, glabrous. Leaves ovate, ovate-elliptic or -oblong, apex rather abruptly subcuspidate-acuminate for 1-2 cm, base broadly attenuate to obtuse-rounded, subcoriaceous, edge slightly revolute, glabrous, somewhat shiny above, dull beneath, densely tuberculate on both surfaces when dry, 9-11 x 3.5-5 cm, lateral nerves 8-10 pairs, straight in the basal, curved-ascending in the distal part, anastomosing before the edge, slightly raised beneath; petiole 4-6 mm long. Racemes axillary, cyme-like, laxly-flowered, 2-3 cm long, glabrous; pedicels 5-6 mm long. Flowers grayish-whitish. Calyx cup-shaped, hardly denticulate, 0.5 mm long. Petals linear-oblong, acutish, concave, fleshy, 10-11 x 2 mm, glabrous outside, white-hairy in the lower 2/3 inside the upper edge membranaceous, crisped and inflexed, each petal ending in a deeply bifid appendix (apparently the upper part of a staminodium which remains attached to the top of a petal) which is uncinately recurved at full anthesis. Stamens 7-8, unequal. Ovary oblong; style rather short. Drupe ovoid or pyriform, bluish-blackish when ripe, its size apparently that of P. olacoides.

Discussion:Common names and uses. The roots of P. uncinatum together with those of P. olacoides deliver the much sought aphrodisiac ‘muira puama’ (Anselmino, 1933b).

Ptychopetalum uncinatum is very closely related to P. olacoides, differing only in the characters mentioned in the key.
Distribution:Brazil South America| Amazonas Brazil South America| Pará Brazil South America|