Herbs to 50 cm tall, anisophyllous. Stems 4-angled, sulcate, bifariously pubescent. Petiole (0-)3-7 mm, sparsely pubescent; leaf blade ovate-elliptic to rarely narrowly ovate or lanceolate, smaller of pair 2-3.5 × 0.4-2.9 cm and larger one 5.5-12.5 × 2-4.5 cm, glabrous or sparsely pubescent along veins, cystoliths prominent, secondary veins 4-7 on each side of midvein, base attenuate, margin serrulate, apex caudate to acuminate. Inflorescences axillary, pedunculate heads; peduncle 0.6-3.5 cm, simple or 3-furcately branched, sulcate, bifariously pubescent, apically thickened; bracts elliptic to ovate-elliptic, 6-13 mm, caducous, multicellular gland-tipped pubescent, abaxially densely covered with cystoliths, apex acute; bracteoles lanceolate, ca. 5 × 1 mm. Calyx 5-lobed almost to base; lobes lanceolate to linear, 6-8 mm, unequal with one longer than others, outside multicellular gland-tipped pubescent. Corolla purple, ca. 3.5 cm, outside sparsely gland-tipped pilose but subglabrous at anthesis, inside glabrous except for trichomes retaining style; tube basally cylindric and ca. 2 mm wide for ca. 8 mm then gradually widened to ca. 1.2 cm at mouth; lobes ovate, ca. 3 mm, apex emarginate. Stamens 4, included; filaments pilose; short filament pair ca. 2 mm, equal, incurved; longer filament pair 7-8 mm, unequal; anther thecae subspherical, ca. 1.3 mm in diam., nodding. Ovary brownish gland-tipped pilose; style ca. 2.8 cm, gland-tipped pilose. Capsule not seen. Fl. Oct.
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