''Cirsium eatonii'', commonly known as Eaton's thistle or mountaintop thistle, is a

North America North America is a continent in the Northern Hemisphere and almost entirely within the Western Hemisphere. It is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South America and the Car ...

n species of flowering plants in the family

Asteraceae The family Asteraceae, alternatively Compositae, consists of over 32,000 known species of flowering plants in over 1,900 genera within the order Asterales. Commonly referred to as the aster, daisy, composite, or sunflower family, Compositae w ...

. The species has been found in

Idaho Idaho ( ) is a state in the Pacific Northwest region of the Western United States. To the north, it shares a small portion of the Canada–United States border with the province of British Columbia. It borders the states of Montana and Wyom ...

Montana Montana () is a state in the Mountain West division of the Western United States. It is bordered by Idaho to the west, North Dakota and South Dakota to the east, Wyoming to the south, and the Canadian provinces of Alberta, British Columbi ...

New Mexico ) , population_demonym = New Mexican ( es, Neomexicano, Neomejicano, Nuevo Mexicano) , seat = Santa Fe , LargestCity = Albuquerque , LargestMetro = Tiguex , OfficialLang = None , Languages = English, Spanish ( New Mexican), Navajo, Ker ...

Wyoming Wyoming () is a U.S. state, state in the Mountain states, Mountain West subregion of the Western United States. It is bordered by Montana to the north and northwest, South Dakota and Nebraska to the east, Idaho to the west, Utah to the south ...

Nevada Nevada ( ; ) is a U.S. state, state in the Western United States, Western region of the United States. It is bordered by Oregon to the northwest, Idaho to the northeast, California to the west, Arizona to the southeast, and Utah to the east. N ...

Utah Utah ( , ) is a state in the Mountain West subregion of the Western United States. Utah is a landlocked U.S. state bordered to its east by Colorado, to its northeast by Wyoming, to its north by Idaho, to its south by Arizona, and to it ...

and

Colorado Colorado (, other variants) is a state in the Mountain West subregion of the Western United States. It encompasses most of the Southern Rocky Mountains, as well as the northeastern portion of the Colorado Plateau and the western edge of t ...

Description

''Cirsium eatonii'' is highly variable. It is an erect herb up to 150 cm (60 inches or 5 feet) tall in some populations. The entire foliage is more or less spiny. One plant produces several flower heads with pink to purple or yellow flowers. The species grows at high elevations in grasslands, sagebrush steppes, open savannahs, etc. ;Varieties A number of varieties have been identified, which include: *''Cirsium eatonii'' var. ''clokeyi'' - Clokey thistle,

Spring Mountains The Spring Mountains are a mountain range of Southern Nevada in the United States, running generally northwest–southeast along the west side of Las Vegas and south to the border with California. Most land in the mountains is owned by the Uni ...

thistle, white-spine thistle. This variety is rare and uncommon. -

*''Cirsium eatonii'' var. ''eatonii'' -

*''Cirsium eatonii'' var. ''eriocephalum'' - alpine thistle, mountain thistle -

*''Cirsium eatonii'' var. ''hesperium'' - tall mountain thistle -

*''Cirsium eatonii'' var. ''murdockii'' - northern mountain thistle -

* ''Cirsium eatonii'' var. ''peckii'' - ghost thistle, Steens Mountain thistle -

Oregon Oregon () is a U.S. state, state in the Pacific Northwest region of the Western United States. The Columbia River delineates much of Oregon's northern boundary with Washington (state), Washington, while the Snake River delineates much of it ...

*''Cirsium eatonii'' var. ''viperinum'' -

Snake Range The Snake Range is a mountain range in White Pine County, Nevada, United States. The south-central portion of the range is included within Great Basin National Park, with most of the remainder included within the Humboldt-Toiyabe National Fores ...

thistle -

Cirsium_eatonii_var_eriocephalum_habitus

References

External links

* * * * eatonii Flora of the Western United States Flora of the Great Basin Plants described in 1871 Taxa named by Asa Gray Flora without expected TNC conservation status {{Cynareae-stub