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This weedy Digitaria sp. (crabgrass) is less common and slightly less aggressive than Digitaria sanguinalis (Common Crabgrass). The latter species is a little larger in size and has hairy sheaths; it is more common in dry sunny areas than Smooth Crabgrass. Both of these species are native to Eurasia, rather than North America, and they are common pests in lawns. In high quality natural areas, they are rarely observed. There are also native Digitaria spp. in Illinois, but they are less common and largely confined to sandy areas (including sand prairies). They are more erect than the Eurasian crabgrasses and the stalks of their racemes are more narrow and wiry (less than 1 mm. across).

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© John Hilty

Source: Illinois Wildflowers

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