Rootstock producing a tuber. Tuber 40-120 diam., depressed with warty upper surface. Stem annual, twining, up to few m long, pubescent. Leaves somewhat fleshy, petiolate; petiole 2-6 mm long; lamina ovate, lanceolate, ovate-oblong or elliptic-oblong, up to about 50 mm long, sometimes undulate, pubescent. Flowers in pedunculate lateral cymes, few to many, developed in succession; peduncle up to about 12 mm long; pedicels 3-9 mm long, puberulous. Sepals deltoid-lanceolate to subulate. Corolla straight or somewhat curved, 20-30 mm long, puberulous; tube 15-25 mm long, sub-globosely inflated at base up to 5 mm diam., cylindric above, slightly dilated at throat; lobes connate at tips, linear-oblong, 5-10(-12) mm long, spreading wider than mouth, replicate, glabrous or puberulous on back, tomentose-villous or glabrous on inner face. Corona united at base, sub-campanulate; outer lobes spreading, forming a 5-fluted or lipped bowl 0.75 mm deep; inner lobes arising from within bowl, 2 mm long, lanceolate-acuminate in upper half, 0.5 mm broad, attenuated into a slender stipe or claw. Follicles slender, smooth, slightly diverging, 60-140 mm long.
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Twining perennial herb. Corolla puberulous outside, lobes often with slightly pinched-in margins towards base, spathulate above; tube slightly expanded to mouth. Flowers whitish or light green spotted purple or maroon.
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