Oxalis dillenii, also the southern wood-sorrel and slender yellow woodsorrel, is part of the wood-sorrel family Oxalidaceae, in the genus Oxalis. The appearance of this species is consistent with the clover-like look of the family. Flowers are made of five yellow petals that are 4 to 10 millimetres (0.16 to 0.39 in) in length. Leaflets are 1 to 2 centimetres (0.39 to 0.79 in) wide with pointed hairs. Fruits are rather brown and 1.5 to 2.5 centimetres (0.59 to 0.98 in). It is often considered a weed, and can be found worldwide, but likely originated in North America.
- Gleason & Cronquist (1991). Manual of Vascular Plants of Northeastern United States and Adjacent Canada (2nd ed.). The New York Botanical Garden.
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