Please try our next iteration of the Michigan Flora Online here. Beginning on February 1, 2023, michiganflora.net 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.
Coefficient of Conservatism:
Coefficient of Wetness:
PRICKLY COMFREY, ROUGH COMFREY
A native of the Caucasus region, also cultivated and rarely escaped to roadsides and yards. First collected in 1898 in Jackson Co.
Intermediate plants with ± prickly stems (though perhaps the prickles fewer, straighter, and/or less flattened), with calyx intermediate (ca. 4.5–7 mm long at anthesis), and sometimes with ± decurrent leaves are apparently the hybrid S. ×uplandicum Nyman, which is more common than pure S. asperum. Specimens referable to the hybrid are known from Cheboygan, Gratiot, Ingham, Iron, and Washtenaw Cos.
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. January 30, 2023. https://michiganflora.net/species.aspx?id=596.