Flora of North America species comparison

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Cirsium hydrophilum var. hydrophilum
Photo is of parent taxon

Suisun thistle
Heads

usually 2.5–3 cm.
Cypselae

oblong, ca. 5 mm.
2n

= 32.

Cirsium hydrophilum var. hydrophilum
Phenology Flowering spring–summer (May–Sep).
Habitat Tidal marshes
Elevation 0–5 m (0–0 ft)
Distribution
from FNA
CA
[BONAP county map]
Discussion

Of conservation concern.

Suisun thistle is known only from the Suisun Marsh (Solano County) in the Sacramento River delta.

Variety hydrophilum is listed by the U.S. Fish and Wildlife Service as endangered.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 19, p. 132.
Parent taxa Asteraceae > tribe Cardueae > Cirsium > Cirsium hydrophilum
Sibling taxa
C. hydrophilum var. vaseyi
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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