Missouri Plants Yellow wood sorrel   (Oxalis stricta) Tracheophyta: Angiosperm: Dicot: Wood Sorrel (Oxalidaceae) Native North American Plant Habitat: any full sun area. ID Features: leaves with 3 leaflets, each leaflet heart-shaped, yellow flowers. Natural History: Wood sorrel is a small plant with palmately compound leaves and yellow flowers with 5 petals. Seeds are born upright in capsules. It is a very common weed that grows in almost any untended area.

The information is from: Missouri Wildflowers by Edgar Denison, 5th Edition, Missouri Department of Conservation, ©1998.