upright yellow woodsorrel

Also known as Common Yellow Woodsorrel, Common Yellow Oxalis, Upright Yellow-Sorrel, Lemon Clover

Upright yellow woodsorrel is a delicate herb recognized by its three heart-shaped leaflets that fold downward at night and during rain. In late spring and summer, tiny five-petaled yellow flowers open on slender stalks, followed by erect seed pods that shoot seeds outward when mature. Found across lawns, fields, and garden beds, it provides nectar for solitary bees and serves as a larval host plant for small butterflies.