Herbs annual. Stems 13-26 cm tall, branched from base, white pilose, angles purple-brown. Petiole shorter to longer than blade; leaf blade broadly ovate to oblong-ovate, 1-2.3 × 0.7-2.1 cm, bipinnate-partite, white pilose, densely so abaxially, occasionally yellow glandular, lobes linear-oblong to ovate-oblong, margin entire or occasionally 1-or 2-serrate, apex obtuse to rounded. Spikes terminal, (1-)2-8 × 1.2-1.4 cm, white pilose; verticillasters numerous, 4-10-flowered, contiguous upward, widely spaced basally; floral leaves linear-lanceolate upward, as long as calyx, margin entire, apex acuminate; bracteoles linear-subulate, minute. Pedicel 1-4 mm. Calyx 5-6 × 3.5 mm, white pilose, throat oblique, 15-veined; teeth ovate, sinuses with a thickened fold, margin scarious, apex short spiny; posterior teeth ca. 1.8 mm, anterior teeth shorter. Corolla purplish, 6.5-8 mm, villous; tube 5-6 mm, gradually dilated upward; upper lip short, straight, 2-lobed; middle lobe of lower lip un-equally dentate. Posterior stamens slightly exserted. Nutlets brown, triquetrous, oblong, 1.7-2 × 0.8-1 mm, base acute, apex rounded, sparsely hairy or glabrous. Fl. Jun-Aug, fr. Aug-Sep.
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