Herbs perennial, rhizomatous. Stems erect or ascending, 30-60 cm, slightly scabrid at base, ± puberulent, angles and nodes villous, branches few or none. Petiole 0-2 mm; leaf blade oblong-lanceolate, 3-7 × 1-2 cm, adaxially sparsely puberulent, villous, abaxially densely white villous-tomentose, villous on veins, base shallowly cordate, margin crenate-serrate, apex acute. Verticillasters 6-flowered, lower widely spaced, upper in terminal spikes 5-8 cm; floral leaves sessile, lanceolate, longer than calyx, margin subentire; bracteoles linear-setiform, ca. 1 mm, puberulent. Calyx campanulate to obconical-campanulate, ca. 7 mm, 10-veined, glandular villous-tomentose, veins sparsely villous, accessory veins inconspicuous; teeth triangular-lanceolate, ca. 2.5 mm, subequal or lower 2 longer, apex spinescent. Corolla reddish or reddish purple, ca. 1.3 cm, sparsely puberulent; limb densely pilose; tube ca. 7 mm, throat puberulent, annulus inconspicuous or absent; upper lip oblong; lower lip spreading, middle lobe reniform, lateral lobes ovate. Filaments puberulent. Nutlets brown, ovoid, ca. 1 mm in diam., glabrous.
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Annual herb, erect. Stem 30-60 cm, rarely branched, often densely villous. Leaves thick-membranaceous, narrowly elliptic or lanceolate, 4-6 by 1.5-2.5 cm, broadly acute, base truncate or subauriculate, margin crenate-serrate, densely villose on the surfaces; petiole about 0.5 cm. Verticillasters 4-10-flowered, in distant upper axils, forming spike-like inflorescence, to 15 cm long or more; rachis tomentose. Bracts narrowly elliptic, 6 mm long. Calyx campanulate, 5-6 mm long, in fruit 6-7 mm, pilose; the 3 upper teeth slightly longer; the 2 lower teeth joined (BACKER 26072) or nearly free (VAN STEENIS 11657). Corolla reddish violet, 10-12 mm long, strigose without, upper lip 3-4 mm long, lower lip 5-6 mm long. Nutlets broadly obovoid, flattened, 1.8 by 1.6 mm, sub-triquetrous.
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