Flora of North America species comparison

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Cirsium douglasii var. breweri
Photo is of parent taxon

Brewer's swamp thistle, Brewer's thistle, Douglas' thistle, swamp thistle
Habit Plants to 250 cm.
Cauline leaves

usually unlobed or shallowly lobed, spines usually less than 2–7 mm.
Heads

mostly 2–3 cm.
2n

= 30.

Cirsium douglasii var. breweri
Phenology Flowering summer (Jun–Aug).
Habitat Wet soil, streams, fens, marshes, springs in montane coniferous forest areas, often on serpentine
Elevation 1200–1900 m (3900–6200 ft)
Distribution
from FNA
CA; NV; OR
[BONAP county map]
Discussion

Variety breweri grows from the eastern North Coast Ranges of California and the Klamath and Siskiyou ranges east to the northen Sierra Nevada.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 19, p. 133.
Parent taxa Asteraceae > tribe Cardueae > Cirsium > Cirsium douglasii
Sibling taxa
C. douglasii var. douglasii
Synonyms Cnicus breweri, C. breweri, C. douglasii var. canescens
Name authority (A. Gray) D. J. Keil & C. E. Turner: Phytologia 73: 313. (1992)
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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