Shrubs 60-90 cm tall, much branched near base. Branches slender, purple, densely whitish hispidulous. Leaves opposite; petiole 1-3 mm, hispidulous; leaf blade narrowly ovate, (1.5-)4-6 × (1-)2-2.5 cm, thin papery, adaxially sparsely whitish hirtellous, abaxially glandular, whitish hispidulous on veins, base cuneate, margin crenate-dentate above basal 1/3 or coarsely serrate above base, apex acute. Panicles terminal, 6-10 cm; cymes (1-)3-5-flowered, pedunculate, white pilose; bracts ovate, 5-13 × 3-7 mm, margin entire; bracteoles linear, to 1 mm. Pedicel 1.5-3 mm. Calyx campanulate, ca. 2.5 mm, whitish pilose or pubescent outside, glandular, 2-lipped to middle; teeth subequal, ovate-triangular, apex acute. Corolla dark blue except pinkish at base, to 1.4 cm, basally pilose outside. Stamens included. Style included. Nutlets brown, triquetrous, ovoid, glabrous. Fl. Jun-Sep, fr. Sep.
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