Supplements to the Orchid Flora of Taiwan (III): A Newly Recorded Species, Peristylus gracilis

Peristylus gracilis Bl., previously known from Indochina, is here newly reported from Lanyu Island, Taiwan. A description, illustration and distribution map of P. gracilis, and a key to the genus Peristylus in Taiwan are presented. This species is characterized by leaves presented at the upper part of the stem, the laxly arranged small flowers, and by the cylindrical spur that is much longer than the sepals.