FLORA OF LAOS Acantaceae Strobilanthes arborescens sp.nov.
Luang Prabang prov., Pon Xay distr., Houay Man village, Phou Tham Keo Mountain, around point 19°57′44.2′'N 102°25′45.8′'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.