Knoxia  

Knoxia a small genus belongs to subfamily Rubioideae, tribe Knoxieae. The genus consists of nine species and distributed in the tropics from Africa through Northwest Australia (Mabberley, 2008). As the taxonomic account of Rubiaceae is now about to be published for Flora of Thailand in the year 2016-2019, it is necessary to revise some genera.

Duperrea is a monospecific genus and distributed in Myanmar, South-western China, Indo-China and Thailand. The genus belongs to tribe Pavettee, subfamily Ixoroideae