Begonia angularis Raddi

Roots fibrous. Stems to about 2 m tall, grooved, fleshy, light-green, freely branching. Leaves ovate, long-pointed, upper surface dark green and satiny with light, grey-green veins above, pale green below, sometimes flushed red; margins wavy and toothed. Flowers numerous, white, in tight clusters.

Brazil

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.

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