Annual or perennial, herb or undershrub, erect, stout, strongly aromatic, stem tetragonous, hairy, viscid-pubescent; leaves opposite, petiolate, pubescent, broadly ovate, sinuate, shallowly serrulate, acuminate at apex; flowers 2-4 together, in axillary, pedunculate or capitate cymes; bracts minute, setaceous; calyx campanulate, teeth sharp, subulate, erect, villous on the mouth, striate; corolla tubular, 5-lobed, blue, bilipped, upper lip shortly 2 lobed; lower lip abruptly deflexed, saccate, contracted at the base; stamens 4, declinate, slightly exserted, filaments free, pubescent, anthers cells 2, confluent; disc symmetrical; style subentire, shortly bifid; nutles 2, compressed, rugose, brown.