Thanh Hoa Prov., Thuong Xuan Distr., Van Xuan Municipality, Quan village, Xuan Lien Natural Reserve. Secondary broad-leaved evergreen forest on sandstone hills at elevation 300-500 m a.s.l. around point 19°51’27.0’’N 105°12’46.0’’E. Undershrub 0.5-1 m tall on open stream rocks. Syconia green. Very common. Co-dominant of riparian shrubs.