Tuyen Quang Prov., Na Hang Distr., Sinh Long Municipality, from Nam Duong Vill. to Khuoi Phin Vill., around point 22°35′36″ N, 105°22′23″ E, ca. 700 m In heavily logged closed primary evergreen broad-leaved lowland forests on slope of limestone mts. Perennial herb CPC 1305 11 Mar 2011 Loc's photos: Coll.: N.Q.Hieu, N.T.Hiep, P.K.Loc, N.T.Vinh