FLORA OF VIETNAM. Fam. Urticaceae. N. Vietnam, prov. Cao Bang, distr. Ha Lang, municipality Thang Loi,. vicinities of Lung Sam village (N 22°45' E 106°42'). Secondary wet. evergreen broadleaved forest with remnants of primary elements on. steep slopes and bluffs of karst remnant limestone ridge at 550-600 m. elev. Lithophyte herb on vertical shady cliffs. Flowers pinkish. Very. common. No CBL 1692 24 April 1999. International Botanical Expedition of the U.S.A. National Geographic. Society (grant No 6300-98). . Collectors: P.K.Loc, P.H.Hoang, Averyanov L.