Son La Prov., Yen Chau Distr., Muong Lum Municipality, Na Hat village around point 21°00′35”N 104°29′06”E.
Primary coniferous forest with Pinus kwangtungensis and Calocedrus rupestris on very steep rocky slopes of remnant mountain composed with highly eroded solid limestone at elevation 1000-1150 m a.s.l.
Lithophytic herb on vertical cliff. Flowers dull orange-yellow. Very common.
CPC 1887 1 April 2011 Photos. Coll.: L.Averyanov, N.T.Hiep, T.B.Ngan.