Leaves
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Leaves opposite, rarely in whorls of 3 per node, widely spaced, borne on upper 3-8 nodes, those at a node usually unequal, symmetrical or nearly so, thin, chartaceous, elliptic to broadly elliptic or ovate, 7-36 cm long, 2.5-7(-12) cm wide, veins slightly raised on both surfaces, upper surface very sparsely strigose to glabrate, lower surface moderately to densely puberulent along the veins, sparsely to moderately so elsewhere, margins entire to occasionally serrulate in upper 1/2, apex acuminate, base cuneate, occasionally blade abruptly constricted to an attenuate base, petioles 1.2-7(-12) cm long.
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Flowers
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Flowers 1-5(-7) in often compound cymes arising in the leaf axils and occasionally also along stems, puberulent to pilose, the hairs dark brown, peduncles slender, 15-90 mm long, pedicels 4-13 mm long, bracts green, foliaceous, ovate to lanceolate, 16-66 mm long, tardily deciduous; calyx zygomorphic, fusiform in bud, tipped by a beak 3-4 mm long, in anthesis pale green, thin, 18-27 mm long, deciduous after anthesis, tube 16-19 mm long, glabrate to puberulent toward base, upper 3 lobes ca. 5 mm long, tardily separating, lower 2 lobes 8-10 mm long; corolla white, curved near middle, tube subcylindrical, 20-23 mm long, ca. 6 mm in diameter medially, glabrous, upper lobes broadly elliptic, 6-7 mm long, 8-9 mm wide, lower lobes broadly elliptic-ovate, 9-12 mm long, 10-11 mm wide; ovary glabrous; style ca. 7 mm long, glabrous.
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