FLORA OF LAOS Apocynaceae Marsdenia tinctoria R.Br.
Xiangkhouang Prov., Kham Distr., Huad village, Phou tat Vinh mt., around point 19°32′31.6′N 103°39′40.4′E.
Primary and secondary broad-leaved evergreen and semideciduous dry forest on very steep rocky slopes of limestone highly eroded mountains composed by solid marble like limestone at elev. 1200-1400 m a.s.l.
Woody vine 4-8 m long on exposed rocks on mountain top. Flowers yellowish, fragrant. Rare.