(R. & P.) Woods., Ann. Missouri Bat. Gard. 19:69. 1932
Vine; stems sparsely pubescent. Leaves opposite; petioles 2-7 mm long, sparsely pubescent; blades elliptic to oblong-elliptic, acute to acuminate, narrowly cordate at base, 3-8 cm long, 1-3.5 cm wide, glabrous or pubescent especially along veins and margins, sparsely glandular along midrib. Racemes axillary, 3-6 (9) cm long; pedicels 3-5 mm long; bracts linear-lanceolate, 1-5 mm long, scarious; calyx lobes 5, narrowly triangular, 1-1.5 mm long, with a single squamella inside; corolla salverform, yellow with a red throat, the tube 2.5-3 cm long, curved and somewhat gibbous, the lobes 5, spreading, to ca 1.5 cm long; stamens included, attached near throat; anthers ca 1.5 mm long, connate, glued to stigma; nectaries 5, sometimes fewer and united, ca half as high as ovary; stigma 1, pentagonal-umbraculiform. Follicles paired, slender, 8-12 cm long, usually swollen at ± equal intervals; seeds oblong, ca 5 mm long, densely pubescent with a tuft of brownish trichomes ca 1 cm long at apex, the seminiferous area held within swollen areas of follicle. Brown 191, White 132.
Apparently rare; collected only twice on the island. Seasonal behavior uncertain.
Mexico to northern South America. In Panama, known from tropical moist forest in the Canal Zone and Panama and from premontane wet forest in Chiriqui.