Shrubs to 4 m tall, almost glabrous throughout, anisophyllous. Stems 4-angled, sulcate. Petiole to 3 cm; leaf blade broadly elliptic, elliptic, or rarely ovate-elliptic, 4-18 × 2-8 cm, smaller of pair ca. 1/3 size of larger one, both surfaces densely covered with cystoliths, abaxially ferruginous when dry, adaxially dark green, secondary veins 7-11 on each side of midvein, base broadly cuneate, margin apically remotely crenate, apex acuminate to caudate. Inflorescences axillary or terminal, spikes, 1-2.5 cm, few flowered; bracts elliptic to oblong, 3.5-4 × ca. 2 mm, persistent, margin ciliate, apex truncate to rounded; bracteoles oblong to elliptic, ca. 7 × 2.5 mm. Flowers distant on rachis, usually only 1 fertile per node. Calyx ca. 9 mm; lobes oblong-oblanceolate, ca. 4 mm, margin ciliolate, apex obtuse. Corolla purple, 3-3.5 cm, ventricose, outside glabrous; tube basally cylindric and ca. 2 mm wide for ca. 6 mm then gradually widened to ca. 1.4 cm at mouth; lobes ca. 5 mm, apex emarginate. Stamens 4, included; filaments sparsely hirsute, shorter pair ca. 2 mm, longer pair ca. 8 mm; anther thecae oblong, ca. 2 mm. Ovary glabrous; style ca. 1.8 cm, densely hirsute. Capsule oblong, 1.7-2 cm, glabrous, 4-seeded. Seeds ovate in outline, ca. 3 mm, densely covered with appressed trichomes. Fl. Oct-Dec.
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