Tuyen Quang Prov., Na Hang Distr., Sinh Long Municipality, central of Nam Duong Vill., around point 22°35′07″ N, 105°22′14″ E, 344 m In completely logged closed primary evergreen broad-leaved lowland forests on stream banks of limestone areas Perennial herbs, ca. 0.8 m tall; petals and filaments greenish, anther yellow.
CPC 1343 13 Mar 2011 Coll.: N.Q.Hieu, N.T.Hiep, P.K.Loc, N.T.Vinh