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Paracladopus chanthaburiensis, a new species of Podostemaceae from Thailand, with notes on its morphology, phylogeny and distribution

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Paracladopus chanthaburiensis is described from southeastern Thailand. Molecular phylogenetic evidence shows that P. chanthaburiensis and P. chiangmaiensis form the monophyletic genus Paracladopus, which is sister to Cladopus. Some of the characters of the new species are shared by P. chiangmaiensis, some others shared by Cladopus, and the remaining differ from those of the two. The ensiform leaf may be plesiomorphic in the subfamily Podostemoideae. The leaves are borne both at the sinuses of root branching and between successive branches, possibly due to leaf development within and proximal to the root meristem. The phylogeny of P. chanthaburiensis is consistent with the hypothesis that the Cladopus-Paracladopus clade, like the Hanseniella-Hydrobryum-Thawatchaia clade, originated in Thailand or the neighboring region.


Document Type: Research Article

Affiliations: 1: Department of Botany, National Museum of Nature and Science, 4-1-1 Amakubo, Tsukuba, Ibaraki 305-0005, Japan 2: Department of Chemical and Biological Sciences, Faculty of Science, Japan Women's University, 2-8-1 Mejirodai, Tokyo 112-8681, Japan

Publication date: February 1, 2008

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