N. Vietnam, prov. Cao Bang, distr. Thach An, municipality Thuy Hung, vicinities of Na Lit village (N 22°30′ E 106°27′), about 27 km to SE from Cao Bang town. Primary evergreen broadleaved closed dry forest on steep slopes and bluffs near tops of remnant limestone ridge at 450-500 m alt. Epilite herb on vertical wet shadow cliffs. Leaves velvety deep purple above, brightly red-purple below. Common.
CBL 881 04 Dec. 1998
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)