The genus Kohautia (Rubiaceae) is newly recorded for the Flora of Thailand; the species Kohautia gracilis, previously only known from Pakistan, Nepal, India, Sri Lanka and Myanmar, has recently been discovered in Kanchanaburi. Notes on the delimitation of the genus and on the main distinctive character for the taxa of the Oldenlandia–Hedyotis complex and allies (= Hedyotideae in the old sense; now included in an expanded tribe Spermacoceae) are included.
KEY WORDS: Rubiaceae, Kohautia, Kohautia gracilis, Flora of Thailand, new genus record.
Distribution.— Pakistan, Nepal (type!), India, Sri Lanka, Myanmar, SOUTH-WESTERN Thailand.
Ecology.— Low limestone hills (Thailand). Elsewhere: in open grassland, on open dry rocky slopes, on fringes of coniferous forest; also in seasonally moist areas near streams, growing in sandy and clayey soils; mostly in ﬁ re-prone habitats. Altitude: 180 m (Thailand). Elsewhere (65–)250–2000 m. Flowers: December (Thailand). Elsewhere November, January–July
Puff, C. 2013. Kohautia Cham. & Schltdl. (Rubiaceae) – A New Genus record for the Flora of Thailand: K. gracilis (Wall.) DC. discovered in Kanchanaburi. THAI FOR. BULL. (BOT.). 41: : 56–60.