Definition

1. Noun:
   • The collective term for the outer, non-reproductive parts of a flower: The perianth consists of the calyx (sepals) and the corolla (petals), which together enclose and protect the stamens and pistils during the bud stage.

Usage

• The term "perianth" is used in botanical contexts to describe the floral envelope. It is a technical term primarily found in scientific writing, botany textbooks, and detailed plant descriptions.
• It refers to the structure as a whole. When the sepals and petals are similar in appearance, the individual segments may be called "tepals."

Examples

• Noun:
  • The showy perianth of the lily attracts pollinators.
  • In some flowers, like tulips, the perianth parts are undifferentiated and are referred to as tepals.
  • Botanists study the evolution of the perianth structure across different plant families.

Advanced Usage

• "Perianth segments": A phrase used when referring to the individual parts (sepals or petals/tepals) that make up the perianth.
  • The number of perianth segments can be a key identifying feature.

Variants and Related Words

• Tepal (n): A term for an undifferentiated perianth segment, used when sepals and petals look similar, as in lilies or magnolias.
• Calyx (n): The collective term for all the sepals of a flower, forming the outer whorl of the perianth.
• Corolla (n): The collective term for all the petals of a flower, forming the inner whorl of the perianth.
• Floral envelope (n): A descriptive synonym for the perianth.

Synonyms

• Floral envelope: A less common but descriptive synonym.
• Perigone: An older or alternative botanical term with the same meaning.

Related Phrases / Terms

• Perianth tube: A structure formed when the bases of the perianth segments are fused into a tube.
  • The fragrance comes from the nectar within the perianth tube.

Noun

1. collective term for the outer parts of a flower consisting of the calyx and corolla and enclosing the stamens and pistils