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Click on the Scientific Name to view available pictures.
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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