Arching or sprawling, scandent, suffrutescent herbs; stems glabrous, granular-scabrous to inconspicuously short-pubescent above, 1-2.5 m long, to 1.5 cm in diameter, hollow at maturity. Median cauline leaves with blades usually broadly elliptic to oblong or ovate, (8-) 10-20 (-32) cm long, 5-10 (-13) cm wide, mostly 2.5-3 times as long as wide, apically acute or short-acuminate, basally rounded, subcordate or cuneate, marginally indistinctly serrulate or sinuate-crenate with mostly 1-4, pale yellowish callose teeth per cm, glabrous above, beneath glabrous to inconspicuously scaberulent, especially on the principal veins where often granular, spiculate, or inconspicuously short-pubescent; petioles 0.5-1.5(-2.5) cm long. Inflorescences pendent, at first compact, umbellate, elongating into irregular racemes 6-15(-30) cm long, loosely to densely, 3-25(-100)-flowered with the flowers borne singly in the axils of foliaceous bracts; bracts mostly 1-2.5 cm long; peduncle usually conspicuous, 6-15(-20) cm long; pedicels spar-ingly to copiously granular-pustulate, spreading to ascendent, mostly 2-4(-6) cm long, ca. 1 mm in diameter; bracteoles subbasal, linear, 1-3(-6) mm long. Flowers 5-7 cm long; hypanthium nearly glabrous to densely granular-spiculate, rarely short-pubescent, at anthesis 6-9(-12) mm in diameter and 4-7 mm high, hemispheric; calyx lobes linear, inconspicuously bristly, short-pubescent, entire to inconspicuously and remotely denticulate, (4-) 8-19 mm long; corolla tube red and orange, 2.8-4.0 cm long, proximally nearly straight, distally nearly straight to strongly arching or curved abaxially, basally 6-8 mm in diameter, contracting ca. 5 mm from the base to 2.5-4.5 mm in diameter, in the upper third abruptly flaring to ( 10-) 12-15 mm, sparsely to densely beset externally with short, conical protuberances, these rarely completely lacking, glabrous within, the lobes deltoid, acuminate, the lateral lobes falcate, the 2 uppermost lobes reflexed, 8-12 mm long, orange yellow, the 3 lower lobes reddish, reddish orange, or yellowish, the lower and lateral lobes 4-8 mm long, rarely epapillate, mostly with short, conical protuberances; filament tube 4-5.5 cm long, exserted 4-8(-12) mm from the corolla tube, pale yellowish, distally sparingly to densely hirsute with spreading coarse hyaline trichomes 1-2 mm long, basally the filaments distinct from one another but united to the narrowed corolla tube, the anther tube 7-10 mm long, apically white-tufted, the trichomes of the 2 shorter and lowermost anthers partially concrescent into a triangular scale 2.2-3.0 mm long and externally with a fringe of trichomes about half as long, the connectives sparsely to densely hirsute with hyaline trichomes mostly (1-)2-3 mm long. Berries broader than high, leathery, 9-15(-20) mm in diameter; seeds lenticular, nearly circular, shal-lowly foveate-reticulate, ca. 0.7 mm in diameter.
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