Corymbs

Corymbs A corymb is a type of inflorescence in which the flower stalks grow to different lengths, allowing the flowers to form a flat-topped or slightly convex cluster. This arrangement is a common feature in various plant species and is particularly notable in the Asteraceae family.

Structure

In a corymb, the outer flowers have longer pedicels than the inner ones, which results in all the flowers being at approximately the same level. This structure can be either simple or compound. In a simple corymb, the flowers are directly attached to the main stem, while in a compound corymb, the main stem branches out into several smaller stems, each bearing a cluster of flowers.

Examples

Several plant species exhibit corymb inflorescences. Notable examples include:

• Achillea millefolium (commonly known as yarrow)
• Iberis (commonly known as candytuft)
• Sambucus nigra (commonly known as elderberry)

Function

The corymb structure is advantageous for plants as it maximizes the exposure of flowers to pollinators. By having all flowers at the same level, it becomes easier for pollinators such as bees and butterflies to access the nectar and pollen.

Comparison with Other Inflorescences

Corymbs can be compared to other types of inflorescences such as:

• Raceme: In a raceme, flowers are attached by short equal stalks at equal distances along a central stem.
• Umbel: In an umbel, all the flower stalks arise from a common point and are of equal length, forming a flat or rounded cluster.
• Panicle: A panicle is a branched inflorescence with flowers on short stalks along the branches.

Related Pages

• Inflorescence
• Asteraceae
• Achillea millefolium
• Iberis
• Sambucus nigra
• Raceme
• Umbel
• Panicle