FLORA OF VIETNAM. Fam. Orchidaceae. Anoectochilus calcareus Aver. N. Vietnam, Ha Giang prov., Quan Ba distr., Can Ti municipality,. vicinities of Sing Xuoi Ho village (N 23°04' E 104°59'), 26.2 km to. 002° of Ha Giang city. Primary closed evergreen mixed wet mossy forest. (with Cupressus, Taxus, Nagea and Pseoudotsuga) along tops of karst. remnant limestone ridge at elev. 1100-1150 m a.s.l. Lithophytic and. terrestrial forb in shady places. Leaves deep velvety black-brown with. pink-white venation above, unoformly pink-violet below. Rare. No NTH 3573 12 Oct. 1999. . Collectors: N.T. Hiep, N.Q. Binh, L. Averyanov, P. Cribb.