Vientiane Prov., Vang Vieng Distr., vicinity of Vang Vieng town, around point 18°54′58”N 102°24′52”E.
Secondary broadleaved evergreen dry forest on very steep rocky slopes and on the top of remnant mountain composed with highly eroded crystalline marble-like limestone at elevation 400-450 m a.s.l.
Epiphytic and lithophytic vine 3-4 m long among open rocks. Flowers brightly red, lip dark red with white marks. Occasional.
CPC 2443 24 April 2011 Coll.: L.Averyanov, P.V.The.