Subshrubs, much branched, glabrous, anisophyllous. Stems 4-angled, glabrous. Petiole 0.8-1.6 cm; leaf blade narrowly ovate-elliptic, 5-14 × 1.5-5.5 cm, abaxially pale green, pubescent along veins, and with inconspicuous cystoliths, adaxially yellowish green, secondary veins 6-9 on each side of midvein, base cuneate to broadly cuneate and decurrent onto petiole, margin remotely serrate, apex shortly acuminate to caudate. Inflorescences axillary, short spikes; bracts leaflike, petiolate, ovate-elliptic, 0.8-4.5 cm, very persistent, abaxially with conspicuous cystoliths, pinnately veined, margin subentire, apex obtuse; bracteoles petiolate, obovate-spatulate, ca. 4 mm, persistent, subglabrous, 3-veined. Flowers in opposite pairs, 1-1.5 cm apart on rachis, in axils of leaflike bracts. Calyx 7-8 mm, pubescent, 5-lobed almost to base; lobes lanceolate with one longer than others, accrescent in fruit, apex acuminate. Corolla pale purple, 2-2.5 cm, ventricose, outside pubescent, inside subglabrous except for trichomes retaining style; tube basally cylindric and ca. 6 mm wide for ca. 5 mm then slightly bent and regularly widened to ca. 1.2 cm at mouth; lobes oblong, ca. 5 × 4 mm, apex obtuse. Stamens 4, included; filaments hirsute, shorter pair ca. 4 mm, longer pair ca. 6 mm; anther thecae oblong, ca. 2.5 × 1.2 mm; pollen type 3. Ovary comose; style ca. 1.7 cm, hirsute. Capsule ca. 1.4 cm, glabrous, 4-seeded. Seeds ovate in outline, ca. 2.5 × 2 mm, pubescent; areola small. Fl. May-Jun, fr. Jul-Aug.
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