FLORA OF VIETNAM. Fam. Urticaceae. Pellionia sp. N. Vietnam, prov. Lao Cai, distr. Than Uyen, municipality Ho Mit (N. 22°06' E 103°52'). Elevation to Mang Han San quartzite peak by SW. slope from Ban Thao village (SSW macroslope of Hoang Lien Son ridge). Primary wet evergreen broadleaved forest on very steep rocky slope at. 1600-1800 m elev. Lithophyte forb on wet shady vertical cliffs. Very. common. No NTH 2809   21-22 May 1999. International Botanical Expedition of the U.S.A. National Geographic. Society (grant No 6300-98). . Collectors: N.T.Hiep, P.H.Hoang, Averyanov L.