FLORA OF VIETNAM Plants of Phong Nha - Ke Bang National Park Gesneriaceae
Vietnam, Quang Binh Prov., Minh Hoa Distr., Thuong Hoa Municipality, about 2 km to E of Ban On village (17°40′21′'N, 105°58′00E).
Heavily logged primary and secondary closed evergreen broad-leaved forest on middle part of rocky ridge composed with solid and stratified marble-like highly eroded crystalline limestone at elevation 350-450 m a.s.l.
Lithophytic herb up to 1.5 m tall on very steep rocky slope. Flowers light yellow. Locally common.