Vietnam, Quang Ninh Prov., Ha Long city, Ha Long Bay, Me Cung Cave. 20°50’14’’N, 107°04’26’’E. Secondary open broad-leaved evergreen forest and shrubs on very steep rocky slopes and cliffs of remnant island mountains composed with solid highly eroded crystalline limestone at elev. 20-30 m a.s.l. Evergreen tree about 6 m tall. Syconia light green to deep purple-violet. Very common.