B. viscosa

Lithophytic (occasionally terrestrial) deciduous or semideciduous, regularly dioecious under shrub 1-1.5(2) m tall with hardly developed rhizome.; Lithophytic undershrub with erect shoots to 2 m tall in crevices of open vertical cliffs. Locally common. Stems ascending to erect, succulent, glabrous, cylindric, (8)1–1.5 cm in diameter, normally unbranching, silvery-grey to light brownish, with numerous distichously placed leaf and stipule traces at nodes distant on (3)5–10(15) mm, leafless during dry winter, forming leaves of new generation at the end of dry season in March – April.

• Classification: Species
• Plant Type: Thick Stem
• Botanical Section: Diploclinium
• Origin: Asia, Laos
• Originator: Aver. et H.Q. Nguyen
• Date of Origin: 2011