Definition

Noun: * A spiny, invasive weed (Centaurea solstitialis) native to Eurasia, characterized by its bright yellow, thistle-like flowers and sharp spines. It is considered a noxious plant in many regions, particularly in the western United States, where it degrades pastures and natural habitats.

Usage Examples

• Noun:
  • The pasture was overrun with yellow star-thistle, making it unusable for grazing livestock.
  • Yellow star-thistle is a major concern for farmers due to its rapid spread and toxicity to horses.
  • Hikers should avoid areas dense with yellow star-thistle because of its painful spines.

Advanced Usage

• As an ecological threat: The term is often used in agricultural, environmental, and botanical contexts to discuss invasive species management.
  • The county has a program to control the spread of yellow star-thistle.

Variants and Related Words

• Yellow starthistle (noun): An alternative spelling, often written as one word.
• Barnaby's thistle (noun): A less common historical name for the same plant.
• St. Barnaby's thistle (noun): Another historical name.
• Centaurea solstitialis (noun): The formal botanical (Latin) name for the species.

Synonyms

• Invasive thistle
• Noxious weed (this is a category to which yellow star-thistle belongs)

Notes on Meaning

• The primary meaning refers specifically to the plant species . It is not a general term for any yellow thistle.
• The name derives from its distinctive star-shaped arrangement of spiny bracts surrounding the yellow flower head.

Noun

1. European weed having a winged stem and hairy leaves; adventive in the eastern United States