FLORA OF VIETNAM
Orchidaceae
Paphiopedilum helenae Aver.

N. Vietnam, prov. Cao Bang, distr. Ha Lang, municipality An Lac, vicinities of Phia Deng village (N 22°43′ E 106°36′), about 36 km to E from Cao Bang town. Primary open coniferous forest (with Keteleeria fortunei) along tops of remnant limestone ridge at 600 m alt. Epilite herb on vertical shadow cliffs of N exposition near tops of ridge at 600 m alt. Not rare, but certainly wavish due to degradation of primary vegetation.
CBL 789 29 Nov. 1998
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)
Collectors: Averyanov L., P.K. Loc.