(Miers) Woods., Ann. Missouri Bot. Gard. 19:70. 1932
Vine or slender liana; stems sparsely to densely pubescent. Leaves opposite; petioles pubescent, 1-2 cm long; blades elliptic to obovate, acute to acuminate, truncate to subcordate at base, 3.5-8 cm long, 1.5-4 cm wide, glabrous or sparsely pubescent above, glabrous to densely pubescent below, sparsely glandular along midrib. Cymes short, axillary; pedicels short, each subtended by a bract, the bracts lanceolate-caudate, foliaceous, ciliolate, l-3 cm long; flowers 5-parted; calyx 1.5-3.3 mm long, turbinate, constricted below the short, triangular lobes; corolla pale yellow, to 3 cm long, the lobes spreading, to 2.3 cm long and 1 cm wide, reddish at base and rim of tube; stamens united to tube; anthers connate in a ring just below rim of corolla, 4 mm long, the free part of filament and the upper half of tube densely pubescent with stiff, white trichomes; style glabrous; stigma 1, pentagonal-umbraculiform, contained inside anthers; nectaries growing together, nearly as high as ovary. Follicles slender, ± moniliform, terete, ca 10-15 cm long, sparsely pubescent; seeds awl-shaped, ca 8 mm long. Croat 10243, 11614.
Occasional in clearings, especially the Lighthouse Clearing. Apparently flowers throughout much of the year, but most specimens have been collected in the rainy season, from May to December. Flowering plants may be found with mature fruits from the previous flowering, indicating that individual plants probably flower more than once per year.
Southern Mexico to Venezuela. In Panama, known from tropical moist forest in the Canal Zone, Bocas del Toro, Panama, and Darién and from premontane wet forest in Coclé.
See Fig. 453.