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A. A. Reznicek

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Roadsides, railroads, fields, farmyards, and other disturbed sites. First collected in 1920 in Washtenaw Co.

In areas of the Great Lakes region where both this and C. nutans are common and regularly co-occur, hybrids (C. ×orthocephalus Wallr.) are regular. These have not yet been seen in Michigan, but doubtless will be found in time.

The curly septate hairs along the veins of the underside of the leaf in this species are straight when fresh, though still visibly septate. The curling delelops on drying and is a herbarium feature.

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