Cirsium eatonii
(Eaton’s Thistle)
Cirsium eatonii, Hoosier Ridge, Summit Co. 4761
Cirsium eatonii, Hoosier Ridge, Summit Co. 4819
Cirsium eatonii, Hoosier Pass, Park Co. 5270
Cirsium eatonii, French Pass, Summit Co. 04949
Cirsium eatonii, Hoosier Ridge, Summit Co. 4752
Cirsium eatonii, Hoosier Ridge, Summit Co. 4749
Cirsium eatonii, French Pass, Summit Co. 04947
Cirsium eatonii, French Pass, Summit Co. 04952
| Scientific Name | Cirsium eatonii | USDA PLANTS Symbol | CIEA |
| Common Name | Eaton's Thistle, Mountaintop Thistle | ITIS Taxonomic Serial No. | 36365 |
| Family | Asteraceae (Sunflower) | SEINet Reference |
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| Description |
Life zones and habitat: Montane to alpine (9500 to 13000 ft.); open areas, common on rocky alpine slopes. Plant: Upright biennial/perennial, 8 to 28+ inches tall. Leaves: Oblong leaves 1/2 to 2 inches wide and 4 to 14 inches long, deeply pinnately-lobed, with spines at the tip of each lobe; smooth or slightly hairy above, woolly-hairy below. Inflorescence: Spiny bracts around flower heads give white appearance to flowers; central disk florets lavender to purple 3/4 to 1 inch long; no ray flowers. Bloom Period: July to September. References: "Flora of Colorado" by Jennifer Ackerfield, SW Colorado Wildflowers and Larimer County Department of Natural Resources. |
BONAP Distribution Map Map Color Key |
Colorado Status: Native |
© Tom Lebsack 2024
Banner photo: Ten Mile Range and Rhodiola integrifolia (King’s Crown) in Summit County