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This is the most common Digitaria sp. (Crabgrass) in Illinois. It is often found in lawns to the vexation of many homeowners. Another introduced grass that invades lawns, Digitaria ischaemum (Smooth Crabgrass), is a little less common. Smooth Crabgrass has hairless sheaths and spikelets/lemmas about 2 mm. in length, while Common Crabgrass has hairy sheaths and spikelets/lemmas about 3 mm. in length. There are also native perennial species of Crabgrass that occur in sandy areas of Illinois. They are more erect, have more slender leaves, and the stalks of their finger-like racemes are terete, rather than flattened. Another common name for Digitaria sanguinalis is Hairy Crabgrass.


Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© John Hilty

Source: Illinois Wildflowers


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