FLORA OF VIETNAM. Laportea interrupta (Gaudich.) Chew. N. Vietnam, Prov. Cao Bang, distr. Tra Linh, municipalite Quoc Toan,. vicinity of Thang Heng and Lung Tao villages near Thang Heng lake. Broadleaved evergreen closed primary forest on steep slopes and bluffs. of limestone mesas and ridges at 500-650 m alt. Terrestrial and epilitic herb or shrublet up to 1.5 m hg on wet rocky. slopes. Leaves green above, deep purple below, strongly urticate. Very. common, and often abundant in mt forests at 500-600 m alt. No VH 4844  25-27.05.1997. International Botanical Expedition of the U.S.A. National Geographic. Society (grant No 5803-96). . Collectors: L. Averyanov, N.T. Hiep