Son La Prov., Moc Chau Distr., Van Ho Municipality, Hua Tat village, around point 20°46′18″N 104°47′29″E.
Broad-leaved evergreen forest with Pinus kwangtungensis and Podocarpus pilgeri on tops of ridge composed with rocky crystalline solid marble-like highly eroded limestone at elev. 1200-1350 m a.s.l.
Herbaceous vine to 5 m long in open place. Flowers purple-violet. Common.
HAL 9314 28 Oct. 2006 Photo. Coll.: Nguyen Tien Hiep, L.Averyanov, Pham Van The.