Research Paper

Begonia willemii, a new species of Begonia from Sulawesi, Indonesia

Wisnu H. Ardi, Deden Girmansyah, Zulfadli, Daniel C. Thomas

Published on: 23 August 2021

Page: 374 - 377

DOI: 10.6165/tai.2021.66.374

PDF Download pdf

2021 vol.66 no.3 pp.374-377


A new species of Begonia sect. Petermannia (Begoniaceae), B. willemii Ardi, Girm. & D.C.Thomas, is described from Sulawesi, Indonesia. The species is a calciphile endemic to Sulawesi. It is morphologically similar to Begonia gemella but can be easily differentiated by its smaller leaves, a sparse, bristly indumentum on the adaxial lamina surface, simple monochasial male inflorescences, longer pedicels, fewer stamens and two-tepaled female flower. Its conservation status is provisionally assessed as Near Threatened (NT).

Keyword: Begonia gemella, Begonia manuselaensis, Begonia sidolensis endemic, karst, limestone, Petermannia