Begonia gehrtii Irmsch.

Leaves almost circular to 22 cm wide; mid-green, glossy, heavily wrinkled with brown, silky, web-like hairs above and below; margins irregularly toothed. Flowers to 3 cm wide, 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.

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