FLORA OF VIETNAM
Rubiaceae
Ophiorrhiza

Hoa Binh Prov., Lac Son Distr., Ngoc Son Municipality, Khu Village, Bua Coi Mt., around point 20°27′17”N 105°18′52”E.

In heavily logged closed primary evergreen broad-leaved forest on slopes of limestone mts., at elevation about 600-650 m a.s.l.

Terrestrial, wet and rather open places, up to 1.5-2 m tall. Flowers greenish. Rare.

CPC 1710 29 March 2011 Coll.: N.Q.Hieu, L.Averyanov, N.T.Hiep, P.K.Loc, P.V.The, N.T.Vinh, T.B.Ngan, N.Tap, D.D.Dao, V.T.Ha.