Herbs stoloniferous, perennial. Stems simple, erect. Leaves long petiolate; leaf blade cordate. Cymes axillary, long pedunculate. Calyx obliquely campanulate, 10-veined, 2-lipped, upper lip 3-toothed, lower lip 2-toothed. Corolla tubular, base narrow, gradually dilated into ample throat, conspicuously 2-lipped, lips entire; lower lip spatulate-concave, slightly declined. Stamens 4, involute in bud, exserted from upper lip of corolla, anterior 2 slightly longer, inserted at corolla throat; anther cells 2, divaricate, apically confluent. Style subterminal, as long as stamens, 2-cleft, anterior lobe longest. Nutlet 1 per flower when mature, subglobose.
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