A dwarf, prostrate, mat-forming perennial legume from Europe that has naturalized across North American lawns, fields, and roadsides. It grows only a few inches tall and spreads by creeping stems that root at the nodes, carrying three-parted green leaves and globular white flower heads that bloom in late spring. A nitrogen-fixing soil-builder whose showy flowers are notably attractive to bees — though Missouri Botanical Garden flags it as aggressive and weedy, and advises against planting it in Midwestern gardens.