ABSTRACT. A taxonomic study of the genus Gynura Cass. in Thailand is presented. Ten taxa
were enumerated, namely Gynura procumbens(Lour.) Merr., G. calciphilavar.calciphila
Kerr,G. calciphila var. dissecta F.G. Davies, G. integrifoliaGagnep., G. pseudochina(L.)
DC., G. nepalensis DC., G. hmopaengensisH. Koyama, G. cusimbua(D.Don) S. Moore,
G. bicolor(Roxb. ex Willd.) DC. and G. sp.