Shrubs to 2.5 m tall, slightly anisophyllous. Stems basally gray, apically purplish black, glabrous. Petiole 0.5-1.5 cm, glabrous; leaf blade lanceolate-ovate to oblong-elliptic, 3-15.5 × 2.5-6 cm, leathery, glabrous, cystoliths numerous, secondary veins 5-7(-9) on each side of midvein and prominent on both surfaces, base cuneate, margin serrulate to undulate, apex acuminate to acute. Inflorescences axillary, branched spikes, 1.5-5 cm, to 4 per leaf axil, sometimes becoming compound and paniculate; bracts ovate, 3-4 × ca. 2 mm, persistent, abaxially glabrous with numerous cystoliths, margin ciliolate, apex acute; bracteoles ca. 6 × 1.2 mm. Flowers 1 sterile per node. Calyx 8-10 mm, with prominent cystoliths, 2-lipped; lower lip 2-lobed, upper lip 3-lobed; lobes lanceolate-triangular, ca. 6 mm, margins white ciliolate. Corolla pale purple, 3-3.5 cm, ventricose, outside glabrous, inside glabrous except for trichomes retaining style; tube basally cylindric and ca. 2 mm wide for ca. 1 cm then gradually widened to ca. 1.5 cm at mouth; lobes broadly obovate, ca. 5 mm, apex emarginate. Stamens 4, included; shorter filament pair ca. 2 mm, glabrous; longer filament pair ca. 7 mm, villous; anther thecae oblong, ca. 2 mm; pollen type 3. Ovary glabrous; style ca. 2 cm, basally villous. Capsule oblong, 1.2-1.4 cm, glabrous, 4-seeded. Seeds ovate in outline, ca. 2.5 × 2.5 mm, densely covered with appressed trichomes. Fl. Sep-Dec, fr. Dec-Feb.
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