Begonia cubensis Hassk.

Roots fibrous. Stems erect, many, to 40 cm, wood-like with brown felting, branched. Leaves to 5 cm long, tapering to a long narrow point, surface hairless, semi-glossy, mid-green; pale green below with tiny hairs on the veins. Flowers 2 cm wide, white.

W Indies, Cuba

Source: Wright, P.; Goodwin, J.; Spencer, R. (1997). Begoniaceae. In: Spencer, R.. Horticultural Flora of South-eastern Australia. Volume 2. Flowering plants. Dicotyledons. Part 1. The identification of garden and cultivated plants. University of New South Wales Press.

Distribution map
kingdom Plantae
phylum   Tracheophyta
class    Magnoliopsida
superorder     Rosanae
order      Cucurbitales
family       Begoniaceae
genus        Begonia L.