Please try our next iteration of the Michigan Flora Online here. Beginning on February 1, 2023, will point to this new site.

The new site offers several benefits over the existing website, including real coordinate mapping, giving a clearer view of the density of documentation as well as more precision about plant distributions and their link to landforms. We will also have the ability to update species pages more regularly, both in terms of new collections and as more existing Michigan specimens are georeferenced. In addition, we have a better photo display, and offer indented keys.

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1. Phyllaries (outer) 3โ€“5 (โ€“6) mm wide below the middle; heads ca. 4โ€“9 cm in diameter, nodding at maturity and solitary at the ends of branches.

C. nutans

1. Phyllaries less than 2 mm wide; heads less than 4 cm in diameter, erect, solitary or clustered on branches.

2. Lower surface of leaves glabrate except for long, curled, septate hairs along veins.

C. acanthoides

2. Lower surface of leaves sparsely to densely tomentose with fine, non-septate hairs and often with curled, septate hairs along veins as well.

C. crispus

All species found in Carduus

Carduus acanthoidesPLUMELESS THISTLE 


MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. January 29, 2023.