FIGURES 4–5. Veratrum mengtzeanum subsp. mengtzeanum (from: Doi Chiangdao, Chiang Mai province, Thailand; photos by Piyakaset Suksathan).
FIGURE 6. Veratrum mengtzeanum subsp. phuwae Trias-Blasi subsp. nov. (from type locality)
The two species of Veratrum in Thailand, V. mengtzeanum and V. chiengdaoense, are supported as conspecific with a detailed morphological study. Two distinct subspecies of V. mengzeanum s.l. are defined based on morphology and distribution, and a new subspecies, Veratrum mengzeanum subsp. phuwae is described. Conservation assessments are provided for both subspecies.
Keywords: Veratrum mengtzeanum, V. chiengdaoense
Veratrum mengtzeanum subsp. phuwae Trias-Blasi subsp. nov.
Differs from V. mengtzeanum subsp. mengtzeanum in having a larger number of flowers per individual and shorter filaments.
Etymology.— This subspecies is named after the Phu Wae mountain peak located in Doi Phu Ka National Park in the northern floristic region of Nan in Thailand, the only known locality. The specific ephithet “phuwae” is a noun in apposition and therefore does not have an additional Latin suffix.
Anna Trias-Blasi and Piyakaset Suksathan. 2013. Delimitation in the Veratrum mengtzeanum — V. chiengdaoense complex (Melanthiaceae) in Thailand based on Morphology, with Commentary on Conservation Status. Phytotaxa. 96 (1): 54–62. DOI: 10.11646/phytotaxa.96.1.2