N. Vietnam, prov. Cao Bang, distr. Ha Lang, municipality Duc Quang, vicinities of Lung Hoai village (N 22°43′ E 106°40′), about 43 km to E from Cao Bang town. Primary open coniferous and mixed semideciduous forest (with Pinus kwangtungensis and Pseudotsuga brevifolia) along tops of remnant limestone ridge at 600-650 m alt. Tree up to 6-8 m hg. Common. Usual codominante of 2 primary forest stratum (codominante of secondary forest formations due to degradation of primary woods).
CBL 761 28 Nov. 1998
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)