|Other names:||large crabgrass, purple crabgrass, hairy crabgrass, hairy crab grass, redhair crabgrass|
Grows in clumps that are often spreading but sometimes upright to 2 ft. Stems are flattened and may have a purplish cast. Leaves are flat and up to 8 inches long with a prominent midvein and are hairy on both sides. Seed heads are in spikes up to 5 inches long.