Dien Bien Prov., Tua Chua Distr., Sin Chai Municipality, around point 22°03′38”N 103°19′56”E.
Primary humid evergreen broad-leaved forest on very steep rocky slopes and on tops of remnant mountain composed with highly eroded marble-like solid crystalline limestone at elevation 1350-1500 m a.s.l.
Lithophyte and epiphyte. Common.
CPC 982a 14 December 2010 Coll.: L.Averyanov, P.K.Loc, P.V.The, N.T.Vinh.
Flowered under cultivation in Hanoi at 28 Feb. 2011. Sepals and petals yellowish, each with 3-5 purple nerves, epichile yellow. Loc photos.