FLORA OF LAOS Acanthaceae Strobilanthes arborescens sp.nov.
Luang Prabang prov., Pon Xay distr., along the way to Bane Phou Souong village, Pha Hiua Bin Toc Mountain, around point 19°57′37.0′'N 102°25′03.0′'E.
Degraded primary evergreen and semideciduous forest on very steep rocky mountain slopes composed by solid marble like highly eroded limestone at elev. 600-850 m a.s.l.
Deciduous treelet 2-5 m tall and to 15 cm DBH on open rocky mountain top. Flowers blue. Very common. Main co-dominant of primary scrub on open rocky mountain tops.