Annuals, 10-40 cm tall, pilose to subglabrous. Primary root undeveloped, lateral roots numerous and fibrous. Stems terete, simple or often branched, straight or ascending. Petiole slender, hairy; leaf blade ovate, 2.5-6 cm, thin, submembranous, pilose or eventually glabrescent, base cuneate, middle and distal margin crenulate, apex acute to obtuse. Flowers solitary in leaf axils. Pedicel 1-5 mm, hairy. Calyx 4-5 mm, densely hairy; tube membranous, somewhat white; lobes equal, oblong-ovate, apex obtuse to apiculate. Corolla yellow, 8-9 mm; tube slightly longer than calyx, hairy; limb subglabrous; lower lip conspicuously plicate, lobes oblong-ovate, subequal, and apically obtuse; upper lip truncate, emarginate. Anthers orbicular, stalked. Ovary and style densely long ciliate. Stigma globose, glabrous. Capsule ovoid-globose, ca. 5 mm, densely hairy, apex acuminate. Seeds yellow, 0.5-0.7 mm. Fl. Jul-Sep, fr. Oct.
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