|Etymology||Genus||Sour, because of the presence of oxalis acid|
|Species||Small horns, likely in reference to the upward pointing fruits|
|Common Names||Yellow Wood Sorrel, Sleeping Beauty, Creeping Wood Sorrel|
Oxalis corniculata have trifoliate leaves that are each heart-shaped. Another similar-looking and very common trifoliate weed of managed turf is Desmodium triflorum. However, the latter only have a slight notch at the tip of the leaflet and each leaflet is arranged 90° from each other at the midrib (O. corniculata's leaflets are aligned almost at 120°).
The form of the Yellow Wood Sorrel, showing its heart-shaped trifoliate leaves and the flower.
Fruit before (left) and after splitting (right). Note the reddish seeds left over.
The yellow flowers are very small relative to the leaves