Flora of North America species comparison

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Cirsium cymosum var. canovirens
Photo is of parent taxon

gray-green thistle
Outer phyllaries

usually much shorter than inner; glutinous ridge prominent, well developed, appearing dark brown on dry specimens.
Larger

heads 15–25 mm diam.
2n

= 34 (as C. canovirens).

Cirsium cymosum var. canovirens
Phenology Flowering spring–summer (Apr–Aug).
Habitat Grasslands, sagebrush steppe, pinyon-juniper woodlands, dry coniferous forests, roadsides
Elevation 600–2600 m (2000–8500 ft)
Distribution
from FNA
CA; ID; MT; NV; OR; WY
[BONAP county map]
Discussion

Variety canovirens occurs from the dry mountains and valleys of eastern Oregon and the rain shadow slopes of the northern Sierra Nevada eastward across the northern Great Basin to Idaho, southern Montana, and western Wyoming. D. J. Keil and C. E. Turner (1993) recognized a polymorphic Cirsium canovirens that included C. subniveum (here treated as C. inamoenum). My subsequent investigations indicate that the merger of those taxa was erroneous, based in part on mis-identified specimens.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 19, p. 136.
Parent taxa Asteraceae > tribe Cardueae > Cirsium > Cirsium cymosum
Sibling taxa
C. cymosum var. cymosum
Synonyms Carduus canovirens, C. canovirens
Name authority (Rydberg) D. J. Keil: Sida 21: 212. (2004)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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(If the plant you're looking for doesn't show up in the auto-complete list, that means it either isn't described in Flora of North America yet, or it's listed under a synonym. And please note that Flora of North America is still missing several plant families, including Apiaceae, Boraginaceae, and Polemoniaceae.)

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