Cirsium hydrophilum var. hydrophilum

Common names: Suisun thistle
EndemicConservation concern
Treatment appears in FNA Volume 19. Treatment on page 132.

Heads usually 2.5–3 cm. Cypselae oblong, ca. 5 mm. 2n = 32.


Phenology: Flowering spring–summer (May–Sep).
Habitat: Tidal marshes
Elevation: 0–5 m

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.

Selected References

None.

Lower Taxa

None.