Definition

Noun: 1. A taxonomic genus of plants: A genus within the family Asteraceae (Compositae), comprising Eurasian herbaceous plants characterized by spiny leaves and stems, and typically large, thistle-like, purplish flower heads.

Usage

• Scientific Classification: Used primarily in botanical and scientific contexts to classify a specific group of thistle plants.
  • The plant was identified as a member of genus Onopordum.
  • Several species within genus Onopordum are considered invasive in certain regions.

Advanced Usage

• "Onopordum acanthium": The most well-known species of this genus, commonly called Scotch thistle or cotton thistle.
  • Onopordum acanthium is often used as a national emblem.

Variants and Related Words

• Onopordum (n): The standardized, non-italicized form used in common language to refer to the genus.
  • The field was overrun with Onopordum.
• Onopordum acanthium (n): A species within the genus.
• Onopordum nervosum (n): Another species within the genus, sometimes called the giant thistle.

Synonyms

• Cotton thistle genus: A common name reference.
• Scotch thistle genus: A common name reference.

Notes

• In botanical nomenclature, the genus name is always capitalized and, in scientific writing, italicized: Onopordum. The term "genus Onopordum" follows the convention of pairing the categorical rank ("genus") with the specific name.

Noun

1. a genus of Eurasian herbs of the family Compositae with prickly foliage and large purplish flowers