Grown habit: Forb/herb
Duration: Biennial, Perennial
Synonyms:
= 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
= Cnicus undulatus A. Gray var. megacephalus A. Gray
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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 Cirsium undulatum (Nutt.) Spreng. var. undulatum
(*) 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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