Oxalis L., Sp. Pl. 433. 1753. Gen. Pl. ed. 5. 198. 1754; Edgew. and Hk. f. in Hk. f. Fl. Brit. Ind. 1 : 435. 1874.
Mostly bulbous herbs with acidic juice. Aerial stem reduced, creeping or rhizomatous. Leaves digitately compound, showing sleep movements. Flowers regular. Stamens monadelphous at the base; filaments 5 long and 5 short, alternating with one another. Ovary 5 locular with one or more ovules in each locule. Often heterostylous (in some European species). Fruit capsular. Seeds with an elastic testa.
A large genus with about 800 species. Mostly found in North and South America, South Africa and fairly well represented in Europe and Asia.