FLORA OF VIETNAM. Pilea sp. N. Vietnam, Prov. Cao Bang, distr. Tra Linh, municipalite Quoc Toan,. vicinity of Thang Heng and Lung Tao villages near Thang Heng lake. Closed evergreen broadleaved primary forest on steep slopes and bluffs. of limestone ridges and mesas at 650-750 m alt. Terrestrial and epilitic herb up to 1 m hg on steep shadow rocky. slopes near and on tops of mesas. Not rare. No VH 4935  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