N. Vietnam, Prov. Bac Can, limestone mountain pass Gio on car road from Hanoi to Cao Bang sity near Ngon Son town at 800-900 m alt. Secondary shrubs and grass communitys on high limestone massif. Terrestrial herb up to 1.5 m hg on steep open rocky selaginella-grassy mt slope. Flowers white, fragrant. Common. VH 4995 28.05.1997 International Botanical Expedition of the U.S.A. National Geographic Society (grant No 5803-96)