FLORA OF VIETNAM. Convallariaceae. Ophiopogon sp. Hoa Binh Prov., Lac Son Distr., Tu Do Municipality, Mon village, around point 20°25'29"N 105°19'36"E. Primary broadleaved forest on steep rocky slopes of remnant mountain composed with solid crystalline highly eroded limestone at elevation about 500-700 m a.s.l. Terrestrial herb to 0.5 m tall in shady place. Flowers dull brownish-green. Common. CPC 1557 25 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.