Stems twining, terete, appressed-hairy, glabres-cent. Leaves oblong, narrowly ovate, ovate, or elliptic, 6-12 by 2½-9 cm, rounded at the base, acute and mucronulate at the apex, appressed-sericeous on both sides, but much more densely beneath than above, and silvery shining; nerves about 6-8 on either side of midrib; petiole much shorter than blade, 6-40 mm. Peduncles axillary, very much shorter than leaves, 5-10 mm long, densely appressed-pilose, 1-3-flowered. Pedicels much shorter than sepals, 4-6 mm. Bracts of lateral flowers lanceolate, 3-4 mm long. Sepals unequal in length; two outer ones ca 12-18 mm long, oblong, acutish or obtusish, with more or less crisped margin, densely appressed-sericeo-tomentose outside, sparsely hairy near apex inside; sepal 3 falcate, ca 12 mm long; two inner sepals broad-ovate, acuminate, ca 9-10 mm long. Corolla funnel-shaped to campanulate, up to 8 cm long, pale purple with white throat; limb slightly lobed; midpetaline bands with long appressed hairs, connecting fields and basal portion of corolla glabrous. Stamens and style included; filaments pilose at the base. Ovary glabrous, 4-celled. Fruit globular, purplish-red, at its base with the patent, enlarged concave sepals, which are purplish red inside. Seeds 4, ca 5 mm long, glabrous except the pilose hilum.
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