Lai Chau Prov., Muong Te Distr., Muong Te Municipality, Nam Cum village, around point 22°32′06″N 102°32′29″E.
Secondary evergreen forest on very steep rocky slopes and bluffs of Song Da River canyon composed with slid gray highly eroded limestone with quartzite dykes at elev. about 250-300 m a.s.l.
Undershrub on exposed shady rocks. Flowers white, tepals with purple tips. Locally very common.
HAL 10115 24 Nov. 2006 Coll.: Nguyen Tien Hiep, L.Averyanov, Pham Van The.