Whorled

Definition

Whorled refers to a leaf arrangement where three or more leaves grow at a single node around the stem. This pattern can aid in maximizing light capture and can be found in various plant species.

5 Must Know Facts For Your Next Test

1. In a whorled arrangement, leaves are symmetrically distributed around the stem.
2. Whorled leaf arrangements are less common compared to alternate or opposite arrangements.
3. Plants with whorled leaves often belong to specific families such as Rubiaceae and Apocynaceae.
4. Whorled patterns can help plants optimize photosynthesis by reducing shading of lower leaves.
5. Examples of plants with whorled leaf arrangements include Galium aparine (cleavers) and Nerium oleander (oleander).

Review Questions

• What is the defining characteristic of a whorled leaf arrangement?
• Name two plant families that commonly exhibit whorled leaf arrangements.
• How does a whorled leaf arrangement benefit a plant’s photosynthesis process?

Related terms

Alternate: A type of leaf arrangement where leaves are singly attached at different heights on the stem.

Opposite: A leaf arrangement where pairs of leaves grow directly across from each other on the stem.

Node: The part of a plant stem from which one or more leaves emerge.