Plants perennial. Stems to 60 cm, branched from base, ascending, densely pubescent. Petiole 6-21 cm, 1-4 cm in stem leaves; leaf blade triangular-hastate to oblong-lanceolate, rarely cordate-ovate, 5-11 × 3-7 cm, adaxially minutely hirsute, base cordate to hastate, margin crenate-dentate, apex acute. Verticillasters 2-4-flowered, widely spaced, in terminal racemes or panicles 8-20 cm; rachis densely pilose; bracts ovate to elliptic, 3-8 × 2.5-3.5 mm, villous. Pedicel 1-5 mm, densely pilose. Calyx campanulate, ca. 1.1 cm, densely red-brown glandular, villous; upper lip triangular-semicircular, ca. 4 × 5 mm, ± 3-mucronate; lower lip ca. 3 × 6 mm, 2-cleft; teeth triangular, apex acute. Corolla purple-red and red-brown or white, 2.1-3.5(-4) cm, pilose, sparsely red-brown glandular on upper lip; tube obliquely pilose annulate inside, ca. 1.7 cm, ca. 2 mm wide below annulus, gradually dilated beyond annulus, exserted, to ca. 8 mm wide at throat; upper lip oblong, ca. 5 mm, margin entire, slightly concave, ciliate; lower lip ca. 7 × 11 mm; middle lobe obovate, apex subtruncate; lateral lobes semicircular. Stamens exserted; filaments ca. 4.5 mm; connectives ca. 3.5 mm, arcuate, arms subequal. Style slightly exserted. Nutlets gray-brown, obovoid, ca. 3 × 2 mm. Fl. May-Aug.
Can be grown by cuttings or seedlings. Seeds needs stratification.
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