Yellow Wood Sorrel
Latin name: Oxalis stricta
Member of the Wood-Sorrel family (Oxalidacea)
The name is derived from the Greek word oxalis ("acid") because the plants have an acidic taste. The plant has inversely heart-shaped leaflets in clover-like arrangements of three. The leaves often fold along the center crease. The erect seedpods and their bent stalks form a sharp angle. The yellow flowers are sometimes reddish at the base. It grows to a height of 6 to 15 inches. It can be found in dry soil and roadsides. It blooms from May to October.
The Yellow Wood Sorrel is common in the Clinch Mountain area.
"A Field Guide to Wildflowers, Northeastern and North-central North America" by Roger Tory Peterson and Margaret McKenny
Photo taken behind my house