Oxalis pes-caprae (Bermuda buttercup, African wood-sorrel, Bermuda sorrel, buttercup oxalis, Cape sorrel, English weed, goat's-foot, sourgrass, soursob and soursop) is a species of tristylous flowering plant in the wood sorrel family Oxalidaceae. Oxalis cernua is a less common synonym for this species. This is an invasive species and noxious weed in many other parts of the world, including the United States (particularly coastal California), Europe, Israel and Australia.
Oxalis pes-caprae is often called by the common name sourgrass or soursob due to its pleasant sour flavour. This sourness is caused by the exceptionally high content of oxalic acid, which is toxic in high doses. The plant is palatable and in modest quantities is reasonably harmless to humans and livestock. In South Africa it is a traditional ingredient in dishes such as waterblommetjiebredie (water flower stew).
The plant has been used in various ways as a source of oxalic acid, as food, and in folk medicine. The raw bulbs have been used to deal with tapeworm and possibly other worms. The plant has been used as a diuretic, possibly hazardously. The lateral underground runners, which tend to be fleshy, have been eaten raw or boiled and served with milk. The golden petals can be used to produce a yellow dye.
This post is part of the Floral Friday Fotos meme,
and also part of the Friday Greens meme.