N. Vietnam, prov. Cao Bang, distr. Bao Lac, municipality Ca Thanh, about 3 km to SW from Yen Lac village (N 22°44′ E 105°50′), about 42 km to NWW from Cao Bang town. Primary open coniferous mossy forest (with Pseudotsuga brevifolia in 1 stratum) along tops of limestone karst remnant ridge at 1400-1450 m alt. Treelet up to 3 m hg. Flowers yellow. Not rare.
CBL 382 18 Nov. 1998
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)