Leaves elliptic to ovate, rarely obovate, apically acuminate, the acumina sometimes prolonged into short caudicles, basally shallowly cordate, the sinuses rarely more than 1 cm deep, the lobes sometimes imbricate, blades mostly 9-15 cm long, to 20 cm or more when older, 4-8(-12) cm wide, above scabrous or rarely short pilose, beneath softly tomentose to velutinous; petioles usually 2-4 cm long, puberulent and pilose. Inflorescences sparsely to densely long pilose throughout; peduncles mostly 5-10 cm long, occasionally elongating with age to 16 cm or more; pedicels commonly 2.5-3.5 cm long. Flowers yellowish or whitish green; calyx abaxially brown puberulent with short hairs and sparse or dense pilose hairs to ca. 3 mm long, the lobes lanceolate-acuminate, usually 5 or more times longer than broad, (9-)11-15(-20) mm long and 2-2.5(-3.5) mm wide, the margins conspicuously undulate; corolla 17-21 mm in diameter, lobes ovate-acute, 6.5-8.5 mm long and 4.5-6.5 mm wide, adaxial surface with a median band of inconspicuous papillae overtopped by a triangular pattern of sparse to dense flattened hairs, the margins glabrate, crispate apically on one or occasionally both margins; corona 1-1.5 mm high, longitudinally striate-sulcate, distinctly 5-lobate; gynostegium 2-3 mm high, the inflated portions of the stamens elliptic to suborbicular in outline, the staminal membranes broadly rounded to triangular covering about one-half the area of the stigma head; ovaries densely pubescent, rarely glabrate. Follicles unknown.
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