Herbs perennial, rhizomatous. Leaves sagittate, base strongly cordate, stellate hairy abaxially, margin coarsely crenate. Verticillasters in oblong spikes. Calyx tubular, conspicuously 10-veined; teeth 5, equal, subulate, apex spinescent. Corolla violet, 2-lipped; tube pilose annulate at middle, throat tomentose; upper lip erect, equal to or shorter than lower lip; lower lip 3-lobed; middle lobe broadly reniform, margin unequally denticulate or undulate; lateral lobes ovate-oblong, much shorter than middle lobe. Stamens 4, included; filaments densely tufted hairy, unequally papillate near base, triangular-dilated at base; anthers reniform. Style longer than stamens, apex unequally 2-cleft, lobes linear-oblong.
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