Subshrubs 2-3 m tall, anisophyllous. Stems erect, slightly sulcate, bifariously puberulent. Petiole 0-5 mm with smaller leaves subsessile; leaf blade ovate, 3-13 × 2-5.5 cm, smaller of pair ca. 2/3 size of larger one, both surfaces glabrous, abaxially pale green, adaxially green and with numerous cystoliths, base rounded to subcordate, margin serrulate, apex acuminate and falcate. Inflorescences axillary, spikes, 3-6 cm, simple or 2-furcate; peduncle 2-5 cm; rachis bifariously pubescent; bracts obovate-oblanceolate, 2.5-3 mm, herbaceous, caducous, glabrous; bracteoles similar to bracts but ca. 1.5 mm. Flowers 3-11 mm apart on rachis. Calyx ca. 1.2 cm in flower, 5-lobed to base; lobes narrowly oblong-elliptic, subequal, glabrous or gland-tipped pubescent, apex acuminate. Corolla yellowish white but dull purple on lobes, campanulate, ca. 2.5 cm, straight, 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 1-1.5 cm at mouth; lobes broadly ovate, ca. 3 × 8 mm, apex rounded. Stamens 4, ± exserted; filaments basally pilose, apically glabrous, shorter pair 7-8 mm, longer pair 9-10 mm; anther thecae ca. 1 mm, incurved; pollen type 3. Ovary glabrous; style 2.7-2.8 cm, glabrous. Capsule not seen. Fl. Jul-Aug.
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