FLORA OF LAOS Cycadaceae Cycas collina K.D.Hill, H.T.Nguyen et P.K.Loc
Houphan Prov., Viengxay Distr., Vieng Xai village, around point 20°23′41.3′'N 104°13′44.5′'E.
Primary and secondary broad-leaved evergreen dry forest on very steep rocky slopes of highly eroded mountains composed by solid marble-like limestone at elev. 800-950 m a.s.l.
Palm-like plant with stem 0.5 m tall and 0.3 m in diam. in rather open place among secondary shrubs on alluvial foothill of limestone mountain. Leaves 2.5 m long. Occasional.