Cirsium edule, the edible thistle or Indian thistle, is a species of thistle in the genus Cirsium, native to western North America from southeastern Alaska south through British Columbia to Washington and Oregon, and locally inland to Idaho. It is a larval host to the mylitta crescent and the painted lady.
Cirsium quercetorum is a species of thistle endemic to coastal California, its common names include brownie thistle and Alameda thistle.
Cirsium arizonicum, the Arizona thistle, is a North American species of thistle in the family Asteraceae, native to the southwestern United States and northwestern Mexico. It has been found in Arizona, southeastern California, New Mexico, Nevada, Colorado, Utah, Sonora, and northwestern Chihuahua.
Cirsium occidentale, with the common name cobweb thistle or cobwebby thistle, is a North American species of thistle in the family Asteraceae.
Cirsium cymosum is a North American species of thistle known by the common name peregrine thistle. It is native to the western United States, where it has been found in California, Oregon, Nevada, Utah, Idaho, Wyoming, and Montana.
Cirsium ochrocentrum is a species of thistle known by the common name yellowspine thistle. It is native to the Great Plains of the Central United States and to the desert regions of the western United States and northern Mexico. Its range extends from eastern Oregon east to the Black Hills of South Dakota, south as far as the Mexican State of Durango.
Cirsium rhothophilum is a rare North American species of thistle known by the common name surf thistle. It is endemic to California, where it is known only from the coastline around the border between San Luis Obispo and Santa Barbara Counties. It grows in sand dunes and coastal scrub near the beach.
Cirsium scariosum is a species of thistle known by the common names meadow thistle, elk thistle and dwarf thistle. It is native to much of western North America from Alberta and British Columbia, south to Baja California. There are also isolated populations on the Canadian Atlantic Coast, on the Mingan Archipelago in Québec, where it is called the Mingan thistle.
Cirsium eatonii, commonly known as Eaton's thistle or mountaintop thistle, is a North American species of flowering plants in the family Asteraceae.
Cirsium altissimum is a North American species of plants in the tribe Cardueae within the family Asteraceae. Common names are tall thistle or roadside thistle. The species is native to the eastern and Central United States.
Cirsium clavatum, the Fish Lake thistle or fringed thistle, is a North American species of plants in the tribe Cardueae within the family Asteraceae. The species is native to the western United States, the States of Wyoming, Colorado, Utah, Arizona, and New Mexico.
Cirsium drummondii, called Drummond's thistle, dwarf thistle or short-stemmed thistle, is a North American species of plant in the tribe Cardueae within the family Asteraceae. The species is native to central and western Canada, in every province from Ontario to British Columbia, plus the Northwest Territories. In the United States, it has been found only in the Black Hills of Wyoming and South Dakota.
Cirsium foliosum , also called leafy thistle, foliose thistle, elk thistle, or Evert's thistle, is a North American plant species in the tribe Cardueae within the family Asteraceae. The species is native to Alaska, Yukon, Northwest Territories, Alberta, British Columbia, and Wyoming.
Cirsium grahamii, called Graham's thistle, is a North American species of plants in the tribe Cardueae within the family Asteraceae. The species is native to Sonora, Chihuahua, Durango, Nuevo León, New Mexico, and Arizona.
Cirsium helenioides, the melancholy thistle, is an Asian and Arctic species of plants in the tribe Cardueae within the family Asteraceae. The species is native to Greenland, Iceland, Norway, Sweden, Finland, Russia, Xinjiang, Kazakhstan.
Cirsium hookerianum, common name Hooker's thistle or white thistle, is a North American species of thistle native to western Canada and the northwestern United States. It is found in the northern Rocky Mountains as well as in some of the northern Cascades and Coast Ranges, in Alberta, British Columbia, Washington, Idaho, Montana, and Wyoming.
Cirsium longistylum, the long-style thistle, is a North American species of plants in the tribe Cardueae within the family Asteraceae. The species is found only in the central part of the State of Montana in the United States, in the portions of the Rocky Mountains called the Big Belt, Castle, Elkhorn, and Little Belt ranges.
Cirsium nuttallii, called Nuttall's thistle, is a North American species of plants in the tribe Cardueae within the family Asteraceae. The species is native to the coastal plain of the southeastern and south-central United States, from eastern Texas to southeastern Virginia.
Cirsium pumilum, the pasture thistle, is a North American species of plants in the tribe Cardueae within the family Asteraceae. The species is native to the northeastern and north-central United States as well as to the Canadian Province of Ontario.
Cirsium turneri is a North American species of plants in the tribe Cardueae within the family Asteraceae. Common names include cliff thistle. The species grows in crevices in limestone cliffs in northern Mexico and western Texas.
