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.