Leaves
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Leaves opposite, borne on upper 4-10 nodes, those of a pair unequal, slightly asymmetrical, thin to occasionally thick, chartaceous, elliptic, occasionally broadly elliptic or ovate, (5-)6-20 cm long, (1.8-)2.3-5(-5.5) cm wide, upper surface sparsely appressed hirtellous, lower surface with slightly raised veins, sparsely to moderately puberulent, occasionally appressed pilose, especially along veins, margins serrate or rarely serrulate, apex acuminate to long-acuminate, base attenuate or occasionally cuneate, petioles 0.8-5.5 cm long, puberulent to moderately villous.
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Flowers
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Flowers 1-2(-4) in cymes arising in
the leaf axils or occasionally on short side branches lower on stems, densely appressed pilose, densely villous, or rarely glabrate, peduncles slender, 0-5(-9) mm long, pedicels slender, (10-)15-30 mm long, elongating to 25-40 mm long in fruit, bracts linear to linear-elliptic, 1-9(-12) mm long; calyx nearly actinomorphic, apparently greenish white when fresh, (8-)12-20 mm long, slightly elongating up to 22 mm long in fruit, cleft to base, the lobes linear-subulate to linear-spatulate, densely appressed pilose to densely villous, occasionally glabrate, within glabrous to occasionally sparsely villous in upper 2/3, apex long-attenuate to rounded; corolla white, slightly curved, tube narrowly funnelform to subcylindrical, (12-)15-18 mm long, ca. 3-4 mm in diameter medially, sparsely pilose, upper lobes broadly elliptic to suborbicular, 5-6 mm long, 6-8 mm wide, lower lobes elliptic to very broadly ovate, 7.5-9 mm long, 6.5-10 mm wide; ovary glabrous, rarely with a few scattered hairs; style 3-5 mm long, glabrous, rarely with a few scattered hairs.
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