|Scientific Name||Cirsium eatonii||USDA PLANTS Symbol||CIEA|
|Common Name||Eaton's Thistle, Mountaintop Thistle||ITIS Taxonomic Serial No.||36365|
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
© Tom Lebsack 2022
Banner photo: Ten Mile Range and Rhodiola integrifolia (King’s Crown) in Summit County