| Abstract: |
Previous herbaria and literature studies have led to the recognition of three species of Parnassia L. in Thailand, P. mysorensis Heyne ex Wight & Arn., P. siamensis Shimizu and P. wightiana Wall. ex Wight & Arn. Recent fieldwork in northern Thailand has revealed large variation in characters traditionally ascribed diagnostic value, which suggests that P. siamensis is probably conspecific with P. mysorensis. The consequence of these findings may well be that the size of the genus worldwide is overestimated. Parnassia is endangered in Thailand by various threats, the most imminent ones are being forest fire, cattle grazing and invasive weeds. Excessive collection for herbarium specimens imposes an increasing threat
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