FLORA OF VIETNAM Ophioglossaceae Ophioglossum nudicaule L. var. rotundifolia Aver., var. nov. Dak Lak Province, Buon Don District, Yok Don National Park, open dry Dipterocarp forest and woodlands with dense low bamboo, at elevation 300-400 m a.s.l., terrestrial ephemeroid herb in open wet place. Very rare. 24 October 2019, L. Averyanov, Nguyen Van Canh, T. Maisak, AL 1170.