Lai Chau Prov., Tam Duong Distr., Ho Thau Community, Ho Thau village, around point 22°22′31″N 103°35′15″E.
Secondary and primary evergreen closed forest on very steep mountain slopes composed with granite and quartzite at elevation from 1100 to 1900 m a.s.l.
Herbaceous vine 3-5 m long on exposed rocks along rocky shady stream valley. Flowers white to light yellowish. Locally common.
HAL 10157 29 Nov. 2006 Photo. Coll.: Nguyen Tien Hiep, L.Averyanov, Pham Van The.