FLORA OF VIETNAM Convolvulaceae Porana racemose Roxb.
Cao Bang Prov., Bao Lac Distr., Hong An municipality, Mi Lung village.
Primary broad-leaved and mixed humid evergreen forest on very steep slopes and along rocky ridge composed with solid crystalline highly eroded limestone at elevation 1500-1550 m a.s.l. around point 22°50′01.3″N 105°50′05.7″E.
Herbaceous vine 2-3 m long in open mossy rocks. Very common.