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Cirsium hydrophilum var. hydrophilum (Greene) Jeps.  
Family: Asteraceae
Suisun thistle
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  • FNA
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David J. Keil in Flora of North America (vol. 19, 20 and 21)
Heads usually 2.5-3 cm. Cypselae oblong, ca. 5 mm. 2n = 32.

Flowering spring-summer (May-Sep). Tidal marshes; of conservation concern; 0-5 m; Calif.

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.
Cirsium hydrophilum var. hydrophilum
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This project was made possible in part by the Institute of Museum and Library Services [MG-70-19-0057-19].
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