Annual or short-lived perennial, 30-50 cm. Stems weakly erect, leafy, quadrangular, little branched, with short eglandular hairs. Leaves broadly ovate, 3-7 x 2. 5-5 cm, thin-textured, with a thin indumentum of short simple eglandular hairs on both surfaces, gland-dotted below, crenate, cuneaterounded; petiole up to 3 cm on lowermost leaves, sesile above. Cymes on slender peduncles forming short panicles. Pedicels slender, erect-spreading, 4-6 mm. Calyx in flower 1-1.5 mm, ± densely gland-dotted and with few or no eglandular hairs; teeth subequal, obtuse; fruiting calyx 3-3. 5 mm, obliquely campanulate, curved. Corolla white or with purplish markings, 6-8 mm; tube c. 5 mm straight, clearly exserted from calyx, not gibbous; lower lip somewhat longer than upper. Nutlets c. 0.8 x 0.5 mm, smooth, pale brown, mucilaginous on wetting.

Fl. Per.: August-September.

Type: Nepal, ad Narainhetty, [Buchanan] Hamilton.

Distribution: Pakistan, Kashmir to Nepal and Bhutan, Burma, China.

Although some authors recognize "Plectranthus gerardianus" as a separate species and others recognize it as one of the varieties of Isodon lophanthoides (var. gerardianus (Benth.) Hara), our specimens (with the available material) all seem to be the same taxon. It is another species, like Isodon coetsa which reaches the westernmost extremity of its range in our area.