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029  Oxalis pes-caprae L.


Nome comune: acetosella gialla

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. Indigenous to South Africa, Oxalis pes-caprae or the Bermuda buttercup is a however a highly invasive species and noxious weed in many other parts of the world, including the United States (particularly coastal California), Europe, Israel and Australia.[1] The plant has a reputation for being very difficult to eliminate once it has spread over an area of land.{[2]} The weed propagates through its underground bulbs and this is the principal reason why it is so difficult to eradicate, as pulling up the stems leaves the bulbs behind. Soil in which the plant has grown is generally filled with small bulbs.[citation needed] Kluge & Claassens (1990) reported a potential biocontrol agent using Klugeana philoxalis, a larval feeder on shoots of O. pes-caprae.[3] O. pes-caprae is also a host to broomrape.[4] Oxalis pes-caprae is often called by the common name sourgrass or soursob due to its pleasant sour flavor. This sourness is caused by oxalic acid, which is toxic in large quantities and may contribute to kidney stones.[citation needed] 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).[citation needed] It is not a serious forage concern in South African pastures, unless favoured by overgrazing. In some countries where the plant is invasive, such as in southern Australia, it grows in enormous quantities of high density in pastures and similar situations.[citation needed] In pastures outside South Africa where it has become dominant it can cause dramatic stock losses where, for example, hungry stock, such as sheep released just after being shorn, are let out to graze and gorge on the plant.[citation