Herbs perennial, stoloniferous. Stems erect, 25-45 cm tall, simple or very short branched, white lanate. Petiole 4-7 mm, white lanate; leaf blade ovate-oblong, 2.5-4 × 1-1.6 cm, papery, adaxially appressed pubescent and ± rugulose, abaxially densely white lanate, base truncate or broadly cuneate, margin irregularly serrulate, apex obtuse or acute. Spikes 2-4.5 cm, verticillasters 2-4-flowered; bracts linear-lanceolate, 3-4 mm, pilose. Pedicel ca. 2 mm, pilose. Calyx campanulate, ca. 5 × 2.5 mm, pilose outside, 2-lipped; teeth ca. 1/4 as long as calyx and ciliate, upper 3 ovate-triangular and lower 2 triangular-lanceolate, apically acute. Corolla purple, ca. 1.2 cm, sparsely white puberulent outside, throat white puberulent, tube ca. 1/3 or more as long as corolla; middle lobe rhombic-obovate, ca. 2/5 as long as limb, lateral lobes ovate-oblong. Anterior stamens as long as corolla limb. Style slightly exserted. Nutlets brownish, 2 or 3, well developed, unequal, subglobose, ca. 1 mm in diam., smooth. Fl. Aug, fr. Sep.
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