Plants perennial. Stems (15-)35-80 cm, unbranched, with deciduous pilose hairs, subglabrous basally, striate in grooves. Petiole to 15 cm; leaf blade cordate-ovate to hastate-ovate, 6.5-9 × 5.5-9 cm, adaxially sparsely pilose, densely so on veins, abaxially subglabrous or pilose along veins, densely dark purple glandular, base cordate to hastate, margin double crenate-dentate, mucronate, apex acute. Verticillasters 3-6-flowered, in racemes 16-18 cm; rachis densely brown villous; bracts subcircular to ovate, margin ciliate. Pedicel 4-7 mm, densely brown villous. Calyx campanulate, dark purple to purplish when dry, 1.7-2 cm abaxially, 2-2.2 cm adaxially, villous on veins, glandular, glabrous inside; upper lip broadly oblate, ca. 6 × 13 mm; lower lip longer than upper, 2 teeth broadly triangular, ca. 5 mm, margin ciliate, apex acuminate; fruiting calyx dilated, membranous. Corolla dark purple, 4.5-5 cm, pendulous, subglabrous or pilose, finely pilose annulate inside; tube 3.5-6 cm, ca. 4 mm wide, abruptly dilated adaxially, to 1.3 cm wide at throat; upper lip straight, oblong, ca. 9 mm; middle lobe of lower lip subcircular, margin slightly crenulate; lateral lobes semicircular. Filaments ca. 9 mm; connectives semicircular, arms subequal. Style slightly exserted.
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