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Stem twining, with a deciduous white tomentum on the tips of the young shoots, soon becoming glabrous. Leaves spreading; petiole 2 1/2–4 lin. long; blade 1 1/2–3 1/2 in. long, 1/2–5 lin. broad, linear or linear-lanceolate, acute, usually narrowed into the petiole, but sometimes rounded at the base, glabrous. Cymes pedunculate, subumbellately or racemosely 2–4-flowered, glabrous; peduncle 1–1 1/2 in. long; pedicels 1/2– 3/4 in. long, thickened at the apex. Sepals 1/8 in. long, ovate-lanceolate, acute. Corolla 3/4 in. or more in diam., saucer-shaped, 5-lobed to half-way down, with the margins of the broadly deltoid acute lobes and the mouth and inside of the very short tube velvety pubescent, otherwise glabrous, white or pinkish, veined with purple at the base, whence 5 purple rays extend to the sinuses between the lobes. Coronal-lobes 2 1/2 lin. long, lanceolate or deltoid-acuminate, entire, bifid, or trifid at the apex, gibbous and crumpled at the base. Style-apex slightly convex, not exceeding the anthers. Follicles 1 1/2–2 in. long, about 5 lin. thick, not inflated, lanceolate, acute, glabrous. Seeds very small, 1 lin. long or less, ovate, biconvex, very narrowly margined, grey.