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Family Asteraceae
Cirsium altissimum (L.) Hill
Roadside Thistle
Tall Thistle
Wood Thistle
Cirsium arvense (L.) Scop.
Californian Thistle
Canada Thistle
Creeping Thistle
Field Thistle
Cirsium brevifolium Nutt.
Palouse Thistle
Cirsium canescens Nutt.
Platte Thistle
Prairie Thistle
Cirsium discolor (Muhl. ex Willd.) Spreng.
Field Thistle
Pasture Thistle
Prairie Thistle
Cirsium flodmanii (Rydb.) Arthur
Flodman's Thistle
Prarie Thistle
Cirsium foliosum (Hook.) DC.
Drummond's thistle
Elk Thistle
Leafy Thistle
Meadow thistle
Cirsium macrocephalum C.A.MEY.
Cirsium occidentale ((Nutt.) Jepson
Cobwebby Thistle
Cirsium ochrocentrum Gray
Beaumont Thistle
Yellowspine Thistle
Cirsium P. Mill.
Hill's Thistle
Hollow-rooted Thistle
Praire Thistle
Cirsium palustre (L.) Scop.
European Swamp Thistle
Marsh Thistle
Cirsium pumilum (Nutt.) Spreng.
Pasture Thistle
Cirsium undulatum (Nutt.) Spreng.
Gray Thistle
Wavyleaf Bullthistle
Wavy-leaf Thistle
Cirsium vulgare (Savi) Ten.
Bull Thistle
Common Thistle
Fuller's Thistle
Spear Thistle
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