FLORA OF VIETNAM. Urticaceae. Elatostema sp. Phu Tho Prov., Tan Son Distr., Xuan Son Municipality, Du village, around point 21°06'57"N 104°57'17"E. Primary broad-leaved closed wet forest on very steep rocky slopes and cliffs of low remnant mountains composed with highly eroded solid marble-like limestone at elevation 400-600 m a.s.l. Terrestrial herb is shady places on rocky slope. Leaves dark glossy green. Common. HAL 12646 16 February 2009. Coll.: L.Averyanov, P.K.Loc, N.T.Vinh, L.T.Son.