Vientiane prov., Vang Vieng district, close vicinities of Vang Vien town, Phu Ngeum Mt., secondary degraded evergreen forest on steep rocky slopes and cliffs composed with karstic highly eroded marble-like limestone at elevation at 350-500 m a.s.l. Creeping epiphyte on mossy gnarled tree on mountain top. Flower buds dark brown. Occasional. 13 December 2015, L.Averyanov, T.Maisak, M.Nuraliev, N.Vislobokov, AL 203. Begonia viscosa Aver. & H.Q.Nguyen Leafless shrub on open vertical cliff. Occasional. AL 204 (3 cuttings)
Cycas petraea A. Lindstr. & K. D. Hill Lithophytic unbranched treelet to 3 m tall with leaves to 1.5 long, young leaves glaucous, old ? glossy. Common on mountain top. AL 205 (4 seedling tubers)