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

Distribution

• Generated Map
• Legacy Map

Calif.

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.