Oxalis, commonly known as wood sorrel, is a persistent perennial weed that can be a nuisance in lawns and gardens. It features clover-like leaves, often in groups of three, and produces small yellow, white, or pink flowers. Oxalis spreads rapidly through seeds and underground bulbs, making it challenging to control. Effective management includes maintaining healthy lawn practices and using selective herbicides designed to target and eliminate this resilient weed.