FLORA OF LAOS Acantaceae Strobilanthes arborescens sp.nov.
Luang Prabang prov., Pon Xay distr., between Houay Man and Nam Bo villages, Phou Hua Ben Toc Mountain, around point 19°57′33.1′'N 102°25′25.8′'E.
Degraded primary evergreen and semideciduous forest on very steep rocky mountain slopes composed by solid marble like highly eroded limestone at elev. 500-650 m a.s.l.
Deciduous treelet or shrub 2-4 m tall on open karstic rocks on mountain top. Flowers blue. Very common. Main co-dominant of deciduous scrub on open tops of karstic limestone mountains.