Tuyen Quang Prov., Na Hang Distr., Sinh Long Municipality, Na Tau Vill., around point 22°34′22″ N, 105°23′25″ E, 300 m In logged closed primary evergreen broad-leaved lowland forests on stream banks of limestone areas Small shrubs, ca. 3-4 m tall; flowers yellowish, up to 10 cm in diam.
CPC 1361 14 Mar 2011 Coll.: N.Q.Hieu, N.T.Hiep, P.K.Loc, N.T.Vinh