FLORA OF VIETNAM. Fam. Urticaceae. Pellionia sp. N. Vietnam, prov. Lai Chau, about 50 km downstream along Black river. (Song Da), from Lai Chau town (N 22°03' E 103°09') to Nam Ma village. (distr. Sin Ho). Open shale and limestone rocks on steep slopes of the. river at elev. about 220 m. Lithophyte forb on vertical wet shady. rocky cliffs. Common. No NTH 2747   24 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.