Rootstock producing cluster of long fusiform roots. Stem single, annual, 1-3 m tall, climbing and slightly twining, quadrangular, more herbaceous than succulent, moderately hirsute with hairs densest near nodes. Leaves hirsute; petiole 5 mm or more long; blade ovate-lanceolate, cordate, 10 mm or more long. Flowers in small pedunculate cymes; peduncles 10-25 mm long, extra-axillary, thinly hairy; pedicels ±10 mm long. Sepals linear-lanceolate, ±4 mm long. Corolla 30-35(-40) mm long, divided nearly halfway, mainly light green; tube with elliptic-oblong basal inflation ±8 mm long and ±6 mm diam., then narrowed gradually into a short waist and expanded towards mouth to about same diam. as inflation; lobes linear, slightly spreading from tube, with infolded margins which have long clavate, vibratile, caducous hairs from lower half. Corona divided almost to base; outer lobes 2.5-3 mm long with linear-oblong base and divided from about the middle into linear or filiform lobules; inner lobes linear-filiform, ±3 mm long, incumbent-erect, with slightly recurved apex. Pollinia ovoid with short, apical, translucent margin, shortly attached to minutely winged carrier. Follicles ±60 mm long, ±4 mm diam., smooth, glabrous.
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