Flora of Barro Colorado Island

Adenocalymma arthropetiolatum

A. Gentry, Ann. Missouri Bot. Gard. 60:789. 1973

Liana; trunk to 3 cm diam; bark smooth, greenish; stems with 4 phloem arms in cross section; twigs subterete to tetragonal, ± glabrous, drying tan to greenish, the nodes lacking glandular fields; tendrils simple; pseudostipules small, 4-scaled, usually narrow. Leaves 2- or 3-foliolate; petioles 1-6.5 cm long, puberulent; petiolules 0.5-4 cm long; leaflets narrowly ovate, acute to acuminate, rounded to shortly subcordate at base, 5-17 cm long, 2-7.5 cm wide, glabrous to puberulent along main veins; reticulate veins prominulous. Racemes terminal or axillary; flowers with a faint musky odor (fide Gentry), each subtended by a deciduous bract; rachises, pedicels, and calyces puberu­lent; calyx cupular, 5-15 mm long, 5-toothed but ± bilabiate, usually with submarginal, sunken glands; co­rolla bright yellow, 4-8 cm long, puberulent outside and on lobes inside, the tube slender, the apical part cam­panulate, the 2 upper lobes erect, extending horizontally in front of the tube, the other 3 variously reflexed; sta­mens slightly exserted, the pairs nearly equal, the longer 3.5-3.9 cm long; staminodium 12-21 mm long; pistil 5-6 cm long; ovary narrowly cylindrical, 4-5 mm long, 1.5-2 mm wide, puberulent. Capsules unknown (those of the genus oblong-linear, thick, flattened, woody). Standley 40912 (US).

Apparently rare; collected once. Flowers during the late rainy season in October and November.

Known only from Panama, along rivers in tropical moist forest and premontane wet forest in the Canal Zone and Panama.