FLORA OF LAOS Acanthaceae s.l. (Thunbergiaceae) Thunbergia sp.
Vientiane Prov., Vang Vieng Distr., Na Khun Village, around point 18°52′28”N 102°24′21”E.
Remnants of primary evergreen broadleaved forest on flat alluvial valley at the base of high remnant hills composed with solid marble-like highly eroded rocky limestone at elevation around 300 m a.s.l.
Herbaceous vine to 10 m long on trees and also on vertical limestone rocks. Flowers orange, tepals with yellow margin. Very common.