Shrubs 1--3 m tall; branchlets, petioles, inflorescences, calyces, and outside of corollas glabrous or less often minutely stellate tomentose and with glandular hairs when young but glabrescent. Branchlets terete or nearly 4-angled. Petiole 2--15 mm; leaf blade ovate to narrowly elliptic, 7--30 X 1.5--10 cm, abaxially minutely stellate tomentose and with some glandular hairs, adaxially glabrous or with scattered stellate and/or glandular hairs, base cuneate to rounded, margin crenate-serrate to sometime subentire, apex acuminate, lateral veins 10--17 pairs. Inflorescences terminal, thyrsoid cymes, mostly narrow and almost cylindrical, 7--25 X 2--5 cm. Calyx campanulate, 2--3.5 mm; lobes triangular, 0.5--1.7 mm. Corolla lilac, 5--8 mm; tube 4--6.5 X 1.5--3 mm, outside glabrous or pilose above middle; lobes suborbicular, 1.2--1.5 X 1.2--1.5 mm. Stamens inserted just inside corolla mouth; anther sessile. Pistil glabrous. Ovary ovoid, 1.5--1.7 mm. Style 1--1.5 mm; stigma clavate. Capsules ellipsoid, 5--8 X 2--3 mm, glabrous. Seeds brown, spindle-shaped, with slender wings at ends. Fl. Feb-Sep.
Open woodlands, forest edges, stream banks; at elevations from 500-3,000 metres.
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