FLORA OF LAOS Convallariaceae Tupistra orlovii Aver., N. Tanaka & K. S. Nguyen, sp.nov. Bolikhamsai prov., Thaphabat distr., Nam Bon village, Phou Khao Khouay national park, Tad Xai Waterfall, around point 18°27'25.9''N 103°08'17.5''E. Degraded primary and secondary evergreen dry forest along river on eroded sandstone at elev. About 340 m a.s.l. Lithophytic and occasionally terrestrial large herb on shady mossy boulders and river cliffs. Leaves uniform green, fruits glossy green. Rare, but locally abundant. LA-VN 2191 11 April 2017 Photos Coll.: L.Averyanov, N.T.Hiep, N.S.Khang, C.Q.Ngan, T.Maisak. d-EXSICCATES OF VIETNAMESE FLORA 0283/Orlov s.n. & LA-VN 2191 © L.Averyanov