Title: Cirsium Content: thumbnail|Cirsium arvense Cirsium is a genus of flowering plants in the family Asteraceae. It is one of many genera with the common name being thistles. Other genera known as thistles include Carduus, Cynara, Onopordon, and Silybum. They are mostly native to Eurasia and northern Africa. There are about 60 species in North America (although many species have been naturalized outside their native ranges). Most species are considered weeds. Cirsium vulgare is listed as a weed in nine US states. Some species are planted in gardens for their beauty and to attract butterflies. ==Species== *Cirsium acarna - Soldier Thistle *Cirsium acaule - Stemless Thistle, Dwarf Thistle *Cirsium altissimum - Roadside Thistle, Tall Thistle *Cirsium amblylepis - Mt. Tamalpais Thistle *Cirsium andersonii - Anderson's Thistle, Rose Thistle *Cirsium andrewsii - Franciscan Thistle *Cirsium araneans - Jeweled Thistle *Cirsium arcuum - Powderpuff Thistle *Cirsium aridum - Desert Thistle *Cirsium arizonicum - Arizona Thistle *Cirsium arvense - Creeping Thistle, Field Thistle, Canada Thistle **Cirsium arvense var.argenteum **Cirsium arvense var. integrifolium **Cirsium arvense var. mite **Cirsium arvense var. vestitum *Cirsium barnebyi - Barneby's Thistle *Cirsium brachycephalum *Cirsium brevifolium - Palouse Thistle *Cirsium brevistylum - Clustered Thistle *Cirsium calcareum - Cainville Thistle *Cirsium californicum - California Thistle *Cirsium callilepis - Fringebract Thistle *Cirsium campylon - Mount Hamilton Thistle *Cirsium canescens - Platte Thistle, Prairie Thistle *Cirsium canovirens - Graygreen Thistle *Cirsium canum - Queen Anne's Thistle *Cirsium carolinianum - Carolina Thistle, Soft Thistle *Cirsium caulescens *Cirsium centaureae *Cirsium chellyense - Queen Thistle *Cirsium chuskaense - Monarch Thistle *Cirsium ciliolatum - Ashland Thistle *Cirsium clavatum - Lake Thistle *Cirsium clokeyi - Charleston Mountain Thistle, Whitespine Thistle *Cirsium congdonii - Rosette Thistle *Cirsium costaricense *Cirsium coulteri - Coulter’s Thistle *Cirsium crassicaule - Slough Thistle *Cirsium cymosum - Peregrine Thistle *Cirsium diacanthum *Cirsium discolor - Field Thistle, Pasture Thistle *Cirsium dissectum - Meadow Thistle *Cirsium douglasii *Cirsium drummondii - Dwarf Thistle *Cirsium durangense *Cirsium eatonii - Eaton's Thistle *Cirsium edule - Edible Thistle *Cirsium engelmannii - Engelmann Thistle, Engelmann's Thistle *Cirsium eriophorum - Woolly Thistle *Cirsium erisithales - Yellow Melancholy Thistle *Cirsium esculentum *Cirsium flodmanii - Flodman Thistle, Flodman's Thistle *Cirsium foliosum - Drummond's Thistle, Elk Thistle, Leafy Thistle, Meadow Thistle *Cirsium fontinale - Fountain Thistle *Cirsium gilense - Gila Thistle *Cirsium grahamii - Graham's Thistle *Cirsium griseum - Gray Thistle *Cirsium hallii - Hall's Thistle *Cirsium helenioides - Melancholy Thistle, Common Melancholy Thistle *Cirsium heterophyllum - Melancholy Thistle *Cirsium hillii - Hill's Thistle *Cirsium hookerianum - White Thistle *Cirsium horridulum - Yellow Thistle *Cirsium humboldtense - Humboldt County Thistle *Cirsium hydrophilum - Suisun Thistle *Cirsium hypoleucum *Cirsium inornatum - Cloudcroft Thistle *Cirsium japonicum - Japanese Thistle *Cirsium kamtschaticum - Kamchatka Thistle *Cirsium lanatum - Hairy Thistle *Cirsium laterifolium - Porcupine Thistle *Cirsium lecontei - Le Conte's Thistle *Cirsium leo *Cirsium libanoticum *Cirsium loncholepis - LaGraciosa Thistle *Cirsium longistylum - Longstyle Thistle *Cirsium maritimum *Cirsium mendocinum - Mendocino Thistle *Cirsium mexicanum - Mexican Thistle *Cirsium modestum - Lacy Thistle *Cirsium mohavense - Mojave Thistle *Cirsium murdockii - Murdock's Thistle *Cirsium muticum - Swamp Thistle *Cirsium navajoense - Navajo Thistle *Cirsium neomexicanum - Lavender Thistle, New Mexico Thistle *Cirsium nipponicum *Cirsium nuttallii - Nuttall's Thistle *Cirsium occidentale -Cobweb Thistle *Cirsium ochrocentrum - Yellowspine Thistle *Cirsium oleraceum - Cabbage thistle *Cirsium olivescens - Summer Thistle *Cirsium oreophilum - Crow Thistle *Cirsium osterhoutii - Osterhout's Thistle *Cirsium ownbeyi - Ownbey's Thistle *Cirsium pallidum - Pale Thistle *Cirsium palustre - Marsh thistle, European Swamp Thistle *Cirsium parryi - Parry's Thistle *Cirsium pastoris - Snowy Thistle *Cirsium peckii - Steen Mountain Thistle *Cirsium pendulum *Cirsium perplexans - Rocky Mountain Thistle *Cirsium pitcheri - Pitcher's Thistle, Sand Dune Thistle *Cirsium praeteriens - Palo Alto Thistle, Lost Thistle *Cirsium proteanum - Red Thistle *Cirsium pulcherrimum - Wyoming Thistle *Cirsium pumilum - Pasture Thistle *Cirsium pyrenaicum *Cirsium quercetorum - Alameda County Thistle *Cirsium remotifolium - Fewleaf Thistle **Cirsium remotifolium var. remotifolium - Fewleaf Thistle *Cirsium repandum - Sandhill Thistle *Cirsium rhaphilepis *Cirsium rhothophilum - Surf Thistle *Cirsium rivulare *Cirsium rothrockii - Rothrock's Thistle *Cirsium rusbyi - Rusby's Thistle *Cirsium rydbergii - Rydberg's Thistle *Cirsium scabrum - Rough Thistle *Cirsium scapanolepis - Mountain Slope Thistle *Cirsium scariosum - Meadow Thistle *Cirsium scopulorum - Mountain Thistle *Cirsium segetum *Cirsium serrulatum *Cirsium spinosissimum *Cirsium subniveum - Gray Thistle, Jackson Hole Thistle *Cirsium tanakae *Cirsium texanum - Texas Thistle *Cirsium tioganum - Stemless Thistle *Cirsium tuberosum - Tuberous Thistle. Similar to Cirsium dissectum (Meadow Thistle). *Cirsium turneri - Cliff Thistle *Cirsium undulatum - Gray Thistle, Wavy-leaf Thistle, Wavyleaf Thistle **Cirsium undulatum var. tracyi - Tracy's Thistle, Wavyleaf Thistle **Cirsium undulatum var. undulatum - Wavyleaf Thistle *Cirsium validus - Graceful Thistle *Cirsium vernale - Spring Thistle *Cirsium vinaceum - Sacramento Mountain Thistle, Sacramento Mountains Thistle *Cirsium virginense - Virgin Thistle *Cirsium virginianum - Virginia Thistle *Cirsium vulgare - Bull Thistle, Spear Thistle, Common Thistle, Fuller's Thistle (syn. C. lanceolatum) *Cirsium wheeleri - Wheeler's Thistle *Cirsium wrightii - Wright's Thistle ;Hybrids *Cirsium × canalense - Canal Thistle *Cirsium × crassum - Thistle *Cirsium × erosum - Glory Thistle *Cirsium × iowense - Iowa Thistle *Cirsium × vancouverense - Vancouver Thistle