Genus: 6 species.
Region: Tibet, Yunnan, Bhutan, Assam, Arunachal Pradesh, Myanmar, Nepal, Thailand.
Content: terpenoids; flavonoids; catecholics.
BotanyEvergreen or semi-evergreen shrubs or subshrubs; 1 to 3 meters tall.
Stem: square.
Leaves: aromatic; 3 to 12 centimeters long, 1 to 6 centimeters broad; finely toothed; opposite.
Flowers: tubular, two-lipped; on terminal spikes.