FLORA OF LAOS Acanthaceae Strobilanthes arborescens sp.nov.
Luang Prabang prov., Pon Xay distr., Nam Bo village, around point 19°57′23.5′'N 102°26′16.4′'E.
Degraded primary evergreen and semideciduous forest on very steep rocky mountain slopes composed by solid marble like highly eroded limestone at elev. 650-750 m a.s.l.
Deciduous treelet 2-4(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.