Shrubs 1--3 m tall. Branchlets nearly 4-angled, stellate tomentose, glabrescent. Petiole to 6 mm; leaf blade narrowly to very narrowly elliptic, 5--20 X 1--6 cm, abaxially stellate tomentose, adaxially with stellate hairs and some spreading glandular hairs, base cuneate to decurrent, margin serrate, crenate-serrate, or subentire, apex acuminate, lateral veins 7--12 pairs. Inflorescences terminal, almost cylindrical, sometimes formed by three slender spicate or thyrsoid cymes, 6--22 X 1--3 cm. Calyx campanulate, 2--4 mm, outside stellate tomentose, inside with minute glandular hairs or glabrous. Corolla purple to violet or white, outside stellate tomentose and often also with glandular hairs, inside pilose but glabrous at base, tube 4--5.8 X 1--1.3 mm; lobes suborbicular, ca. 1--1.2 X 1--1.2 mm, inside glabrous. Stamens inserted just below corolla mouth; anthers sessile, oblong, 0.8--1.2 mm. Ovary ovoid, 1.5--2 mm, glabrous or shortly stellate tomentose on apical half. Style 1--1.5 mm; stigma clavate. Capsules ellipsoid, 4--6 X 1.5--2 mm, usually glabrous. Seeds fusiform, 2--2.5 mm, with slender wings at both ends. Fl. Apr-Oct.
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