Vietnam, Quang Binh Prov., Bo Trach Distr., Tan Trach Municipality, vicinities of A Rem village (17є23'22''N, 106є12'47''E). Slightly logged primary closed evergreen coniferous forest (with Calocedrus rupestris) on steep slopes and tops of rocky ridge composed with solid marble-like highly eroded stratified crystalline limestone at elevation about 800-900 m a.s.l. Lithophyte. Flowers light dull orange. Common.