A shrubby herb, 0.5—1.5 m tall, stems tetragonous, densely villous or woolly. Leaves are ovate to oblong, 3—8 cm x 1.5—3 cm, densely woolly beneath, sparsely hirsute above, hairs 4-celled, petiole 0.5—2.5 cm long, softly woolly. Inflorescence is a single terminal spike, calyx 8.5 mm x 6 mm, longest teeth 3—4 mm long, in fruit 8—10 mm long, teeth hairy inside, corolla up to 18 mm long, lower lip about 12 mm x 4 mm, lilac or pale blue, filaments almost at same level, about 8 mm long, style about 13 mm long. Nutlets are cylindrical, 1.3 mm x 0.9 mm.

The whole plant, especially the leaves and the roots are used as astringent, carminative, febrifuge and tonic.

PROSEA (Plant Resources of South-East Asia) Foundation
Ethnobotanical Notes

Anisomelic acid, betulinic acid, citral and ovatodiolide (plant)

Given to children in fever during teeth formation (leaf juice); as an antidote against poison (root paste); applied externally over wounds (stem)