Herbs, annual, slender. Stems ascending or erect, 10-20(-40) cm tall, branched, angular but wingless, puberulent. Leaves spirally and laxly arranged; petiole 1-3 mm, hairy; blade suborbicular to elliptic, 6-10(-15) × 6-10 mm, both surfaces puberulent, base truncate, subcordate, or rounded, margin subentire for lower several, but obviously serrate for rest, apex rounded. Flowers solitary, axillary at upper leaflike bracts, forming a lax raceme or corymb; bracts ovate-lanceolate, margin serrate, hairy; pedicels slender, 1.5-4 cm, sparsely puberulent; bracteoles 2, persistent or caducous. Hypanthium obovoid or semiglobose, ca. 2 mm, puberulent; calyx lobes linear-subulate, 2-3 × ca. 0.5 mm, entire. Corolla 2-lipped, pale purple, 4-5(-8) mm; tube 2-divided to base at back, glabrous; upper lobes erect, oblong-linear, lower lobes oblong, slightly shorter than upper ones. Stamens connate into a tube above middle of filaments; filament tube glabrous; anther tube ca. 1 mm, back sparsely villous, apex shortly barbate. Capsule obovoid, 4-5 × ca. 3 mm, sparsely puberulent. Seeds numerous, brown-yellow, 3-angular. Fl. Nov.
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