Definition

Noun: 1. A taxonomic genus name used in former classifications: "Genus Pyrethrum" refers to a historical genus name in botanical classification. It was previously used for a group of flowering plants that have since been reclassified. These plants are known for certain species that yield insecticidal compounds.

Usage Examples

• Noun:
  • In older botanical texts, you might find the plant listed under genus Pyrethrum.
  • The insecticidal properties of genus Pyrethrum made it commercially important.
  • The reclassification moved several species from genus Pyrethrum to other genera.

Advanced Usage

• Historical/Legacy Usage: The term is primarily used in a historical or legacy context within botany, horticulture, and taxonomy to refer to older scientific literature or classifications.
  • When studying the history of botanical insecticides, one must consult sources that reference genus Pyrethrum.

Variants and Related Words

• Pyrethrum (noun): Commonly refers to:
  • The dried flower heads of plants formerly in this genus, used to make insecticide.
  • The insecticide powder made from these flower heads.
  • (In casual gardening) Any of several chrysanthemums with daisy-like flowers.
• Pyrethrin (noun): The active insecticidal compound found in pyrethrum flowers.
• Chrysanthemum (noun): The genus to which many of these plants were later moved.
• Tanacetum (noun): The genus in which many of these plants are now often included.

Synonyms

• (As a historical taxonomic group) Former genus Pyrethrum
• (For the plants themselves) Pyrethrum daisies, Insecticidal chrysanthemums (Note: These are common names, not exact scientific synonyms).

Related Terms (Taxonomic Context)

• Reclassified genus: A term indicating the genus name is no longer current in standard taxonomy.
• Synonym (in taxonomy): In scientific nomenclature, "genus Pyrethrum" is considered a synonym for groups within or .

Noun

1. used in former classifications for plants later placed in genus Chrysanthemum and now often included in genus Tanacetum