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Barneby's thistle

Scientific Name: Cirsium barnebyi

Family: Asteraceae

Category: Dicot

Growth: Forb/herb

Duration: Perennial

Other Names:

       

Centaurea solstitialis: St. Barnaby's Thistle

Centaurea solstitialis, commonly known as St. Barnaby's Thistle, is an annual or short-lived plant belonging to the Asteraceae (or Compositae) family. Other common names include yellow starthistle, golden starthistle, yellow cockspur, yellow star weed, and yellow centaurea.

Considerations for Pets

  • This plant is known to be toxic to horses.
  • The plant is described as thorny, with flower heads surrounded by yellow spines.

Considerations for Children

  • The plant is described as thorny, with flower heads surrounded by yellow spines.

Taxonomy and Nomenclature

  • Scientific Name: Centaurea solstitialis L.
  • Family: Asteraceae (or Compositae)
  • Synonyms: The text implies that the plant is also considered within the Knapweed group.

Distribution and Habitat

  • Native to the Mediterranean Basin region.
  • It has become naturalized in regions such as Texas and other states in the US.
  • It can be found in locations like Crete, Greece.
  • Reported from Massachusetts to Ontario and Iowa

Morphological Characteristics

  • An annual or short-lived plant that can grow up to 75 cm high.
  • Erect, biennial, annual to short lived perennial thistle with woolly winged stems.
  • Characterized by flower heads that are bright yellow and surrounded by rows of yellow spines.
  • Leaves are described as hairy, and the stem as winged.

Ecological Role

  • Considered a weed in various regions, including NSW (Australia), where golden thistle is declared noxious.
  • Mentioned as an adventive herb in the eastern United States.

Interactions with Other Organisms

  • Valued for its pollen, which has a crude protein range of 18% to 26%.
  • It is a source of honey (Yellow Star Thistle or St. Barnaby's Thistle Honey).

Further Information

  • Information available from the RHS (Royal Horticultural Society).
  • Photos can be found at CalPhotos.