Stem slender, climbing, hairy, hairs yellowish, spreading. Leaves long-petioled, cordate-ovate, 2–4 in. long and nearly as broad, acute or shortly acuminate, sometimes subobtuse and mucronate, crenate, clothed with adpressed deciduous yellow hairs above and with white floccose tomentum beneath; petiole slender, about as long as the leaf. Peduncle up to 3 in. long; flowers in small congested cymes; bracts a little shorter than the sepals, lanceolate, bearing on the back stiffish yellow hairs, flanks and margin glandular. Sepals lanceolate-acuminate, under 6 lin. long, hairy and glandular like the bracts. Corolla 1 1/2 in. long. Buds hairy at the tip.