Vellozo 1831
Brazil
Section Pritzelia
This species was introduced to the USA in 1946 by Mulford B. Foster, who had collected it near Rio de Janeiro. It previously bore the reference U254. The species name, acetosa, comes from the Latin acetosus, meaning vinegary, and refers to the slightly acid taste of its leaves.
Appearance
It is a creeping rhizomatous begonia with many spreading stems. The underside of the blade is olive green and covered with white hairs, giving it a characteristic velvety look. The petiole, also hairy, is brown to red. The inflorescence has white flowers of both sexes. The ovary is three-winged.
Culture
It is a fairly common plant in cultivation. It needs high humidity but a moderately moist substrate. Water very little in winter, just enough to stop the leaves wilting. Light is essential for good colour, but no direct sun. The white flowers appear in spring.
Propagation
Petiole cuttings are easy but can be very slow. Rhizome cuttings can also be used. Seed is a simple way to propagate it, as it germinates very easily.
