Begonia acetosa
A creeping rhizomatous begonia from south-eastern Brazil. Its asymmetric, rounded leaves are dull green above and deep wine-red below, and both sides are covered in short white hairs. Mulford B. Foster collected it in forested mountains near Rio de Janeiro in 1946. It flowers white in spring and early summer. It is used in breeding for its foliage, and it grows well in bright shade with warm, humid but airy conditions.
Where it grows wild
Detailed field notes are lacking. Wikipedia describes the collection site as forested mountains near Rio de Janeiro, and the plant's thick, horizontally spreading rhizomes fit a plant of the Atlantic Forest floor and banks, in shade or broken light. It reportedly takes up to about three hours of sun in gardens.
No recorded elevations. 'Forested mountains near Rio de Janeiro' suggests low to mid-elevation Atlantic Forest, perhaps 100–1,000 m, but this is not confirmed.
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