Herbs to 50 cm tall, ascending, weakly anisophyllous. Stems terete, lenticellate, glabrous. Petiole 0.5-2.5 cm, sulcate; leaf blade ovate to lanceolate-ovate, 2.5-13 × 1.5-6 cm, smaller of pair 1/2-2/3 size of larger one, glabrous, cystoliths prominent, secondary veins 4-8 on each side of midvein, base obtuse to cuneate, margin subentire to sparsely crenulate, apex acuminate. Inflorescences from terminal leaf axils, spikes, (1-)3-11 cm, 4-16-flowered; bracts subspatulate, 6-10 × 1.5-3 mm, leathery, glabrous, margin ciliate, apex acute; bracteoles lanceolate, ca. 4 × 0.6 mm, margin ciliate. Flower pairs 0.5-1.5 cm apart on rachis. Calyx 0.9-1.1 cm, 5-lobed almost to base; lobes linear, ca. 1 mm wide, unequal, margin ciliate. Corolla purple, ca. 4.5 cm, outside glabrous, inside glabrous except for trichomes retaining style; tube basally cylindric and ca. 1.5 mm wide for ca. 1 cm then gradually widened to ca. 1.5 cm at mouth; lobes suborbicular, 7-8 × 8-9 mm, apex obtuse. Stamens 4, included; shorter filament pair ca. 3 mm, glabrous; longer filament pair ca. 6 mm, sparsely hirsute; anther thecae oblong, ca. 2.5 × 1 mm, apiculate; connective shortly extended; pollen type 3. Ovary glabrous; style ca. 3 cm, glabrous. Capsule 1-1.5 cm, glabrous. Seeds ovate in outline, ca. 4 × 2 mm, densely pubescent. Fl. Sep-Oct, fr. Oct-Nov.
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