Sourgrass

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Sourgrass

Scientific classification
Kingdom: Plantae
Division: Magnoliophyta
Class: Magnoliopsida
Order: Oxalidales
Family: Oxalidaceae
Genus: Oxalis
Species

O. grandis
O. montana
O. pes-caprae

including Oxalis pes-caprae, also known as Cape Sorrel or Bermuda Buttercup; Oxalis grandis, the large yellow wood sorrel; Oxalis montana, the common wood sorrel; and Rumex acetosella, sheep sorrel. These grow as weeds in many parts of the United States. Oxalis pes-caprae is considered a major nuisance in parts of California. 

These plants have a pleasant lemony taste and are sometime used to season salads, and in herbal remedies. All of these plants contain oxalic acid, which is toxic in high levelsmay cause oxalis isby ethnographers. See, for example, "Archival data on wild food plants used in Poland in 1948" by Łukasz Łuczaj, published in the Journal of Ethnobiology and e 2008, 4:4.