Flora of North America species comparison

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Cirsium douglasii var. douglasii
Photo is of parent taxon

Douglas' swamp thistle, Douglas' thistle
Habit Plants to 150 cm.
Cauline leaves

usually deeply lobed, spines usually 7–20 mm.
Heads

mostly 2.5–3.5 cm.
2n

= 34.

Cirsium douglasii var. douglasii
Phenology Flowering summer (Jun–Aug).
Habitat Springs, seeps, streamsides, coastal bluffs, coniferous and hardwood forests, often on serpentine
Elevation 10–1200 m (0–3900 ft)
Distribution
from FNA
CA
[BONAP county map]
Discussion

Variety douglasii grows in the Coast Ranges from Humboldt to Monterey and San Benito counties.

(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. breweri
Name authority unknown
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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