Rootstock producing a cluster of cylindric or fusiform roots. Stems 1-several, climbing and twining, 1-few m long, glabrous. Leaves somewhat fleshy, shortly petiolate; petiole 4-8 mm long; blade lanceolate to linear, tapering to apex and base, up to 80(-100) mm long, glabrous, sometimes ciliolate on margin, with midrib prominent down back. Flowers in 3-6-flowered umbel-1ike, extra-axillary cymes; peduncles 3-12 mm long; pedicels 1-5 mm long. Sepals subulate, ±2 mm long. Corolla straight or slightly curved, 25-30 mm long, greenish-yellow, glabrous outside, thinly pilose with fine hairs inside at base and middle of tube; tube 20 mm long, oblong-inflated in lower half, 2-3 mm diam., narrowed above, not dilated at mouth but with spreading sinuses; lobes ±15(-20) mm long, more or less equal in length to tube, narrowly linear, curved, connate at tips forming an elongated cage, occasionally becoming partly free. Corona forming 5 very shallow pouches, confluent with base of inner lobes; inner lobes linear-lanceolate or linear-oblong, obtuse, 1.5 mm long, incumbent-erect, then sometimes recurving.
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A climbing herb. It has a cluster of fleshy roots. It keeps growing from year to year. The stems are thin. The stems are twining and the leaves are long and narrow. The flowers are in clusters of 3-6. The fruit are slender green follicles 10 cm long.
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