In biology, a peduncle is the stalk that supports either a single flower or a cluster of flowers (an inflorescence). After the flower is fertilized, the peduncle also supports the developing fruit. Think of it as the main stem connecting the flower or fruit to the main plant stem. It can sometimes have bracts (modified leaves) growing from it.
Understanding the Peduncle: Key Aspects
- Single Flower vs. Inflorescence: A peduncle can support a solitary flower, like a single tulip, or an entire inflorescence, a group of flowers arranged on a branched structure, such as a sunflower head.
- Post-Fertilization Role: The peduncle continues to support the developing fruit after the flower has been pollinated and fertilized.
- Anatomical Features: Peduncles can vary in length, thickness, and structure depending on the plant species. They may also bear bracts, which are small, leaf-like structures.
- Examples: The stem of a single rose is a peduncle. The main stalk holding a bunch of grapes is also a peduncle, supporting the individual fruits.
Peduncle vs. Pedicel
It's important to distinguish the peduncle from the pedicel. While the peduncle supports the entire flower or inflorescence, the pedicel is a smaller stalk that supports individual flowers within an inflorescence.
Peduncle in Different Contexts
The term "peduncle" is also used in zoology, although less commonly. For example, in some marine animals like goose barnacles, "peduncle" refers to a stalk-like structure. In killer whales, the "caudal peduncle" is the area connecting the tail flukes to the body. However, the primary botanical definition remains the most common usage.
