crabgrass(redirected from crab grass)
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crabgrass,name for any of several grassgrass,
any plant of the family Poaceae (formerly Gramineae), an important and widely distributed group of vascular plants, having an extraordinary range of adaptation. Numbering approximately 600 genera and 9,000 species, the grasses form the climax vegetation (see ecology) in
..... Click the link for more information. species of the genera Digitaria, Eleusine, and Panicum, especially the species D. sanguinalis. Crabgrass is a common lawn weed, especially in the S and E United States. The grass has branching stems that may reach a length of 3 ft (91 cm) and flowers borne on purple spikes. It is sometimes cut for hay.