Black Medic (Medicago lupulina )

Annual, broadleaf (sometimes survives as a short-lived perennial).

RANGE: Throughout the United States.

APPEARANCE: With its three leaflet, cloverlike leaves, this legume is often confused with white clover. Low growing, with trailing, slightly hairy stems, it produces clusters of small, bright yellow flowers in late spring to early summer.

GROWTH: Black medic is common in lawns from May through September. It is especially prevalent in dry soils where turf is spotty and in high-phosphorus soils. Though an annual, it can be as persistent as a perennial.

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