N. Vietnam, Prov. Cao Bang, distr. Tra Linh, municipalite Quoc Toan, vicinity of Thang Heng and Lung Tao villages near Thang Heng lake.
Closed evergreen broadleaved primary forest on steep slopes and bluffs of limestone ridges and mesas at 650-750 m alt. Epilitic herb up to 1.5 m hg on open rocks and vertical bluffs near and on tops of mesas. Flowers yellow. Common.
No VH 4940 25-27.05.1997
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 5803-96)
Collectors: L. Averyanov, N.T. Hiep
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