Son La Prov., Mai Son Distr., Muong Tranh Municipality, Bong village, around point 21°14′51″N 103°49′17″E.
Broad-leaved secondary open dry forest on steep slopes composed with clay shale at elev. 900-1200 m a.s.l.
Terrestrial undershrub 0.5-0.1.5 m tall in open short tall grasslands on mountain top. Flowers white, tepals with purple-violet marks. Locally very common.
HAL 9573 07 Nov. 2006 Photo. Coll.: Nguyen Tien Hiep, L.Averyanov, Pham Van The.