N. Vietnam, prov. Cao Bang, distr. Nguyen Binh, municipality Nguyen Binh (N 22ш37' E 105ш52'), about 41 km to W from Cao Bang town. Elevation from Le A pass to Na Ni mt. peak at 1400-1900 m alt. Open wet steep slopes on soils developed on granite and shale rocks. Woody vine up to 10 m hg. Flowers yellow, inflorescence bracts violet. Not rare.
No CBL 021 11-12 Nov. 1998
International Botanical Expedition of the U.S.A. National Geographic
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