Thistle (Cirsium) -

• Fringed Thistle (Centaureae)
  
• Soft Thistle (Carolinianum)
  
• Queen Anne's Thistle (Canum)
  
• Graygreen Thistle (Canovirens)
  
• Queen Thistle (Chellyense)
  
• Monarch Thistle (Chuskaense)
  
• Slough Thistle (Crassicaule)
  
• Whitespine Thistle (Clokeyi)
  
• Fish Lake Thistle (Clavatum)
  
• Ashland Thistle (Ciliolatum)
  
• Prairie Thistle (Canescens)
  
• Canalense (Canalense)
  
• Franciscan Thistle (Andrewsii)
  
• Rose Thistle (Andersonii)
  
• Tall Thistle (Altissimum)
  
• Cainville Thistle (Calcareum)
  
• Jeweled Thistle (Araneans)
  
• Desert Thistle (Aridum)
  
• Palouse Thistle (Brevifolium)
  
• Barneby's Thistle (Barnebyi)
  
• Canada Thistle (Arvense)
  
• Arizona Thistle (Arizonicum)
  
• Crassum (Crassum)
  
• Peregrine Thistle (Cymosum)
  
• Suisun Thistle (Hydrophilum)
  Suisun Thistle, Vasey's Thistle
• Yellow Thistle (Horridulum)
  Yellow Thistle, Yellow Thistle
• Hill's Thistle (Hillii)
  
• White Thistle (Hookerianum)
  
• Cloudcroft Thistle (Inornatum)
  
• Iowense (Iowense)
  
• Le Conte's Thistle (Lecontei)
  
• Porcupine Thistle (Laterifolium)
  
• Kamchatka Thistle (Kamtschaticum)
  
• Japanese Thistle (Japonicum)
  
• Graham's Thistle (Grahamii)
  
• Gila Thistle (Gilense)
  
• Eaton's Thistle (Eatonii)
  
• Dwarf Thistle (Drummondii)
  
• Douglas' Thistle (Douglasii)
  Douglas' Thistle, Douglas' Thistle
• Field Thistle (Discolor)
  
• Edible Thistle (Edule)
  
• Engelmann's Thistle (Engelmannii)
  
• Flodman's Thistle (Flodmanii)
  
• Fountain Thistle (Fontinale)
  Mt Hamilton Thistle, Fountain Thistle, Chorro Creek Bog Thistle
• Elk Thistle (Foliosum)
  
• Clustered Thistle (Brevistylum)
  
• Wright's Thistle (Wrightii)
  
• Parry's Thistle (Parryi)
  Mogollon Thistle, Parry's Thistle
• Marsh Thistle (Palustre)
  
• Pale Thistle (Pallidum)
  
• Ownbey's Thistle (Ownbeyi)
  
• Steen Mountain Thistle (Peckii)
  
• Rocky Mountain Thistle (Perplexans)
  
• Pasture Thistle (Pumilum)
  
• Wyoming Thistle (Pulcherrimum)
  
• Palo Alto Thistle (Praeteriens)
  
• Sand Dune Thistle (Pitcheri)
  
• Osterhout's Thistle (Osterhoutii)
  
• Yellowspine Thistle (Ochrocentrum)
  Yellowspine Thistle
• Mojave Thistle (Mohavense)
  
• Lacy Thistle (Modestum)
  
• Mexican Thistle (Mexicanum)
  
• Longstyle Thistle (Longistylum)
  
• Murdock's Thistle (Murdockii)
  
• Swamp Thistle (Muticum)
  
• Cobwebby Thistle (Occidentale)
  Cobwebby Thistle, Snowy Thistle, Compact Cobwebby Thistle
• Nuttall's Thistle (Nuttallii)
  
• New Mexico Thistle (Neomexicanum)
  
• Navajo Thistle (Navajoense)
  
• Pyrenean Thistle (Pyrenaicum)
  
• Alameda County Thistle (Quercetorum)
  
• Validus (Validus)
  
• Wavyleaf Thistle (Undulatum)
  Tracy's Thistle, Wavyleaf Thistle
• Cliff Thistle (Turneri)
  
• Texas Thistle (Texanum)
  
• Spring Thistle (Vernale)
  
• Sacramento Mountain Thistle (Vinaceum)
  
• Wheeler's Thistle (Wheeleri)
  
• Bull Thistle (Vulgare)
  
• Virginia Thistle (Virginianum)
  
• Virgin Thistle (Virginense)
  
• Jackson Hole Thistle (Subniveum)
  
• Mountain Thistle (Scopulorum)
  
• Rothrock's Thistle (Rothrockii)
  
• Surf Thistle (Rhothophilum)
  
• Sandhill Thistle (Repandum)
  
• Fewleaf Thistle (Remotifolium)
  
• Rusby's Thistle (Rusbyi)
  
• Rydberg's Thistle (Rydbergii)
  
• Meadow Thistle (Scariosum)
  
• Mountain Slope Thistle (Scapanolepis)
  
• Rough Thistle (Scabrum)
  
• La Graciosa Thistle (Loncholepis)