Vietnam, Quang Binh Prov., Minh Hoa Distr., Thuong Hoa Municipality, Yen Hop village, about 1 km to NWW of Ban On village (17є40'21''N, 105є58'00''E). Primary closed evergreen broad-leaved and coniferous lowland forest (with Dacrydium elatum) along rocky ridge composed with solid marble-like highly eroded stratified crystalline limestone at elevation 550-650 m a.s.l.
Terrestrial herb on open forest with bamboo on top of ridge. Flower buds brown. Not common.