FLORA OF VIETNAM
Rubiaceae
Ophiorrhiza sp.?

Cao Bang Prov., Nguyen Binh Distr., Ca Thanh Municipality, Cao Lu village, around point 22°42′47.7″N, 105°51′50.8″E.

Primary coniferous forest with Pseudotsuga sinensis along highly eroded rocky limestone ridge at elevation about 1300 m a.s.l.

Undershrub to 1 m tall along rocky ridge. Flowers whitish. Common.

4 October 2013 CPC 5397
L.Averyanov, N.T.Hiep, L.M.Tuan, N.S.Khang, T.Maisak, L.Osinovets