||Leaves in whorls of 3 per node or opposite, borne on upper 4-8 nodes, those at a node slightly unequal, symmetrical or nearly so, thin or rarely thick, chartaceous, elliptic to ovate, 4.5-23(-29) cm long, 1.5-6.6(-8.2) cm wide, upper surface sparsely hirtellous, lower surface moderately to sparsely or occasionally densely velvety short-pilose, margins serrate or rarely serrulate, apex acuminate to long-acuminate, base cuneate to attenuate, petioles 0.8-9 cm long.
||Flowers (1)2-5 in cymes arising in the leaf axils and occasionally along stems, sparsely to moderately brown pilose, peduncles 20-40(-55) mm long, pedicels 13-27 mm long, bracts ± foliaceous, ovate to narrowly lanceolate, 7-16 mm long; calyx nearly actinomorphic, white or pale green when fresh, thin, 11-19 mm long, cleft to base, the lobes foliaceous, occasionally rather thick and then not especially foliaceous, narrowly elliptic, occasionally narrowly lanceolate or oblong-lanceolate, moderately to sparsely short-pilose or glabrate, glabrous within, apex acute; corolla white, tube narrowly funnelform, curved, ca. 12-18 mm long, ca. 4-5 mm in diameter medially, glabrous to sparsely pilose, upper lobes ovate, ca. 3-4 mm long, ca. 4-5 mm wide, lower lobes broadly ovate, ca. 6-7 mm long, ca. 6-8 mm wide; ovary glabrous or with a few scattered hairs; style 4-6 mm long, glabrous.