Grown habit: Forb/herb
Duration: Biennial, Perennial
Synonyms:
= Cirsium undulatum (Nutt.) Spreng. var. undulatum
= Carduus helleri Small
= Carduus undulatus Nutt.
= Cirsium helleri (Small) Cory
= Cirsium megacephalum (A. Gray) Cockerell
= Cirsium ochrocentrum A. Gray var. helleri (Small) Petr.
= Cirsium undulatum (Nutt.) Spreng. var. megacephalum (A. Gray) Fernald
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Distribution in USA and Canada (*)
USA (AZ, CA, CO, GA, IA, ID, IL, IN, KS, MI, MN, MO, MT, ND, NE, NM, NV, OK, OR, PA, SD, TX, UT, WA, WI, WY), CAN (AB, BC, MB, SK)
Map for Cnicus undulatus A. Gray var. megacephalus A. Gray
(*) USDA, NRCS. 2009. The PLANTS Database (http://plants.usda.gov, 28 August 2009). National Plant Data Center, Baton Rouge, LA 70874-4490 USA
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