N. Vietnam, prov. Cao Bang, distr. Ha Lang, municipality Thanh Nhat (N 22°41′ E 106°40′), about 42 km to E from Cao Bang town. Primary open coniferous and mixed semideciduous forest along tops of remnant limestone ridge at 600 m alt. Terrestrial herb on shadow steep slopes. Flowers pale blue-violet. Very common.
CBL 733 27 Nov. 1998
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)