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Suisun thistle

Scientific Name: Cirsium hydrophilum var. hydrophilum

Family: Asteraceae

Category: Dicot

Growth: Forb/herb

Duration: Biennial, Perennial

Other Names:

       

Suisun Thistle (Cirsium hydrophilum)

The Suisun thistle, scientifically known as Cirsium hydrophilum, is a rare thistle species endemic to California.

Considerations for Pets

  • Thistles, in general, are known for having prickly or thorny characteristics. The Suisun thistle, as a thistle species, may present a similar physical hazard.

Taxonomy and Nomenclature

  • Scientific Name: Cirsium hydrophilum (Greene) Jeps.
  • Variety: Cirsium hydrophilum var. hydrophilum (Greene) Jeps.
  • Common Name: Suisun thistle
  • Family: Aster (Asteraceae)

Distribution and Habitat

  • The Suisun thistle is endemic to California.
  • Specifically, it is found in the San Francisco Bay Area and the Sacramento-San Joaquin Delta.
  • It grows in tidal marshes.

Ecological Role

  • Some California thistles are introduced noxious weeds, but the Suisun thistle is a rare native perennial.
  • It is federally-listed as endangered.

Morphological Characteristics

  • The Suisun thistle grows to a height of 1 to 2 meters (approximately 3 to 6 feet).
  • The flowers are pink.

Interactions with Other Organisms

  • Pipevine swallowtail butterflies are particularly attracted to the purple-flowered Suisun thistle.

Further Information

  • Encyclopedia of Life: Contains articles about the Suisun Thistle.
  • CalPhotos
  • California Native Plant Society
  • CDFW BIOS GIS Dataset
  • Discover Life