- Bulletin of the National Science Museum. Series B, Botany (ISSN:03852431)
- vol.30, no.1, pp.21-34, 2004-03
The taxonomy of Vernonia sects. Xipholepis and Claotrachelus was examined. Six species of sect. Xipholepis and one of sect. Claotrachelus are enumerated in this paper. Of them, three species are described as new to science from Thailand and one species is newly recorded from Thailand. The chromosome number is reported of four species in this paper: Vernonia doichangensis 2n=54, V. ngaoensis 2n=36, V. silhetensis var. subserrata 2n=54 and V. squarrosa var. orientalis 2n=18.