Plants rhizomatous. Stems basally woody, erect, rarely trailing, to 1 m tall, terete, apically narrowly angular, glabrous to densely with yellow short curly hairs. Leaves alternate; petiole short; leaf blade ovate to ovate-lanceolate, 8-18 X 3-9 cm, papery to leathery, glabrous or abaxially sparsely puberulent, base rounded to rarely cordate, margin deltoid dentate, apex acuminate to caudate-acuminate. Inflorescences axillary, sometimes terminal, 3-10 cm, densely glandular hairy or hispidulous (sometimes excluding corolla); bracts narrow. Calyx much shorter than corolla; lobes subulate. Corolla white or purple, 5-6 mm, slightly curved forward, glabrous or glandular hairy outside; limb actinomorphic; lobes ca. 1/4 of corolla length, narrowly triangular. Stamens conspicuously exserted; filaments basally hairy. Ovary entirely or apically glandular hairy. Capsule ovoid, ca. 3 mm, hairy when young. Seeds ovoid-globose, ca. 0.5 mm; seed coat obscurely reticulate. Fl. Jul-Sep.
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