N. Vietnam, Prov. Cao Bang, distr. Tra Linh, municipalite Quoc Toan,
vicinity of Thang Heng and Lung Tao villages near Thang Heng lake. Dry broadleaved evergreen closed primary forest on steep slopes and bluffs of limestone ridges and mesas at 650-750 m alt. Terrestrial and epilitic rosette herb up to 0.6 m hg on steep shadow rocky slopes. Leaves with contrast whitish longitudinal stripes. Flowers white, tHeng yellow. Common. VH 4904 25-27.05.1997 International Botanical Expedition of the U.S.A. National Geographic Society (grant No 5803-96)