Begonia arborescens var. oxyphylla

Roots fibrous. Stems erect to 1 m tall, fleshy, brown with reddish hairs. Leaves long, narrow to 13 cm long, upper surface mid-green, glossy, hairless, with light green, faintly red flushed reverse; margins round-toothed to pointed. Flowers white.

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. (as Begonia oxyphylla)

kingdom Plantae
phylum   Tracheophyta
class    Magnoliopsida
superorder     Rosanae
order      Cucurbitales
family       Begoniaceae
species        Begonia arborescens