Names: perkai, phaypush; Boi
Region: east Asia, Himalayas.
Habitat: scrub and savannah slopes; altitudes of 1700 to 2700 metres; dry hillsides and rocks; moist soil; semi-shade to full sun.
Content: pentacyclic triterpenes, plectranthoic acid, betulinic acid, oleanolic acid; phenolic acids, caffeic acid, rosmarinic acid; glycosides, terpenoids, alkaloids, tannins, anthraquinones, flavonoids, saponins, oils, steroids, cardiac glycosides, β-cyanin, coumarins, reducing sugars, diterpenoids, that is, rugosinin, effusanin-A, effusanin-B, effusanin-E, lasiokaurin, ridonin, triterpenoids, plectranthoic acid A and B, acetyl plectranthoic acid, plectranthadiol; essential oil, with sesquiterpene, δ-amorphene, α- muurolol, phyllocladene, 4-epi-abietal, hydrocar- bons, β-caryophyllene, germacrene-D, α- humulene, trans-ferruginol, abietatriene, totarene, caryophyllene acetate, cubenol, allo-hedycaryol, amorpha-4,9-dien-2-ol, (Z)-nuciferol acetate, viridiflorol.
Use: insect repellant; cosmetic.
BotanyShrub; deciduous; to 1.5 m tall.
Stem: erect. fragrance.
Flower: hermaphrodite; flowering from July to September.
Leaves: ovate; opposite; serrated margin; ventricle side is covered with dense small hairs.