Definition

1. Noun:
   • A specific species of thistle: Onopordon acanthium is the scientific name for a tall, biennial plant, commonly known as cotton thistle or Scotch thistle. It is characterized by its spiny, hairy stems and leaves, and its pale purple flower heads.

Examples of Usage

• Noun:
  • The field was overtaken by the imposing Onopordon acanthium, its spiny leaves deterring grazing animals.
  • Botanists study Onopordon acanthium for its ecological role in dry, disturbed habitats.

Advanced Usage

• In botanical or ecological contexts: The term is used precisely to identify this specific species within scientific writing, conservation discussions, or horticultural guides.
  • The invasive potential of Onopordon acanthium is a concern in some non-native regions.

Variants and Related Words

• Common Name: Cotton thistle, Scotch thistle.
• Genus Name: (the genus to which this species belongs).
• Related Term: Thistle (the common name for plants in several genera, including , , and , known for their spiny leaves and stems).

Synonyms

• Botanical Synonym: (an alternative spelling of the genus).
• Common Name Synonyms: Scotch cottonthistle, Scottish thistle.

Notes on Meaning

• This term refers exclusively to a single botanical species. It does not have different meanings in everyday language and is primarily used in scientific or specialized contexts.

Noun

1. biennial Eurasian white hairy thistle having pale purple flowers; naturalized in North America