Taxonomy and distribution of the plant family Podostemaceae in Phitsanulok and Phetchabun provinces, Thailand

รายงานการวิจัย -- มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร, 2557Recent explorations of Podostemaceae have discovered 2 new species to science (Dalzellia TWA-216 และ Hydrobryum TWA-198) from Phitsanulok Province and 3 more genera and six more species from previously known (2 genera and 4 species). Totally, five genera and 10 species occur in Phitsanulok and Phetchabun provinces. Based on morphological and molecular evidence, the taxa are classified into subfamily Tristichoideae including 2 genera and 3 species (Dalzellia 2 spp. and Terniopsis 1 sp.) and subfamily Podostemoideae consisting 3 genera and 7 species (Hanseniella 1 sp., Hydrobryum 5 spp. and Thawatchaia 1 sp.). The species found in both provinces are Hy. phetchabunense and Hy. tardhuangense while D. kailarsenii is found only in Phetchabun. The plants discovered only in Phitsanulok include Dalzellia TWA-216, Hydrobryum TWA-198, Han. heterophylla, Hy. bifoliatum, Hy. kaengsophense, Th. trilobata and T. minor. Among the species found, Hy. tardhuangense and Th. trilobata are also distributed to the Lao PDR, and the rests are endemic to Thailand.Rajamangala University of Technology Phra Nakho