Definition

1. Noun:
   • A dense cluster of flowers or foliage: In botany, a "capitulum" is a dense, head-like cluster of flowers, often resembling a single flower. This is the characteristic inflorescence of plants in the daisy family (Asteraceae).
   • The fruiting spike of a cereal plant, especially corn: This meaning refers to the seed-bearing head of certain grasses.
   • An arrangement of leafy branches forming the top or head of a tree: This is a more general botanical term for a dense, rounded cluster of leaves or branches at the apex of a plant structure.

Usage Examples

• Noun:
  • The dandelion's yellow bloom is not a single flower but a capitulum composed of many tiny florets.
  • The farmer examined the capitulum of the wheat plant to assess the grain's maturity.
  • The tree's distinctive shape was due to its broad, rounded capitulum.

Advanced Usage

• In botanical taxonomy, the term "capitulum" is used precisely to describe the specific type of inflorescence found in the Asteraceae family, where numerous small flowers (florets) are packed onto a common receptacle, often surrounded by bracts (forming the involucre).
  • The capitulum of a sunflower consists of both ray florets and disc florets.

Variants and Related Words

• Capitate (adj): Having a head-shaped form or dense cluster. In botany, it describes something growing in a dense head.
  • The plant had a capitate inflorescence.
• Capitular (adj): Pertaining to or resembling a capitulum.
  • The capitular structure is key to identifying the plant family.

Synonyms

• Head: A common, less technical synonym, especially for flower clusters (e.g., flower head, seed head).
• Flower head: Specifically for the botanical inflorescence.
• Spike: Particularly for the cereal grain sense, though a spike is technically a different type of inflorescence where sessile flowers are attached directly to an unbranched axis.

Notes on Different Meanings

• The primary and most specific meaning is the botanical inflorescence (flower head). This is its core technical definition.
• The meaning of a cereal fruiting spike is a specific application of the term to agricultural botany.
• The meaning as a cluster of leaves or branches is a more general structural term in plant morphology.

Noun

1. an arrangement of leafy branches forming the top or head of a tree
2. fruiting spike of a cereal plant especially corn
3. a dense cluster of flowers or foliage
   • a head of cauliflower
   • a head of lettuce