Lai Chau Prov., Sin Ho Distr., Ta Phin Municipality, around point 22°27′13″N 103°16′31″E.
Remnants of broad-leaved evergreen closed primary forest on steep mountain slopes composed with solid crystalline highly eroded limestone at elev. 1100-1200 m a.s.l.
Herb up to 1 m tall among secondary open shrubs. Flowers pinkish. Very common.
HAL 9899 17 Nov. 2006 Coll.: Nguyen Tien Hiep, L.Averyanov, Pham Van The.