FLORA OF VIETNAM
Rubiaceae
Ophiorrhiza sp.

Cao Bang Prov., Nguyen Binh Distr., Yen Lac Municipality, Chi Doi village, around point 22°45′34″N, 105°51′48.7″E.

Primary fractionaly logged coniferous forest with Pseudotsuga sinensis along highly eroded rocky limestone ridge at elevation about 1400 m a.s.l.

Herb or undershrub about 0.5 m tall on vertical shady wet cliff. Flowers light violet. Occasional.

5 October 2013 CPC 5428
L.Averyanov, N.T.Hiep, L.M.Tuan, N.S.Khang, T.Maisak, L.Osinovets