B. rugosula

Lithophytic, evergreen, stemless, regularly monoecious, herb; Rhizome plagiotropic, creeping, fleshy, more or less straight, (5)7–12(15) cm long, (2)3–4(5) mm in diam., densely hairy with longciliate white hairs, with 3–6(8) erect, distant leaves, internodes (0.6)1–2(4) cm long, at nodes with few dark brown, thin, filiform roots faced to the ground.

• Classification: Species
• Plant Type: Rhizomatous
• Botanical Section: Coelocentrum
• Origin: Asia, Vietnam
• Originator: L.V. Averyanov & H.Q. Nguyen, Eleven new species of Begonia L. (Begoniaceae) from Laos and Vietnam.
• Date of Origin: 2011