Common Name:
PASTURE THISTLE
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Coefficient of Conservatism:
4
Coefficient of Wetness:
5
Wetness Index:
UPL
Physiognomy:
Nt B-Forb
M. Demmon
Meadows, fields, clearings, hillsides, river banks, sparsely forested sites; roadsides, vacant lots, pine plantations; doubtless originally in prairie openings.
This species is very similar to C. altissimum. The heads of C. discolor run a little larger (involucre ca. 2.4–3.3 cm long in our material, compared with 2–2.7 cm in C. altissimum), but precise measurements are hard to determine. The white-flowered form [f. albiflorum (Britton) House] has been collected in Calhoun, Lenawee, Oakland, and Washtenaw Cos.