A sepal is a part of the flower of angiosperms (flowering plants), typically green and functioning to protect the developing bud and support the petals once the flower blooms.
Sepals collectively form the calyx, which is the outermost whorl of flower parts. Think of the calyx as the flower's protective shield before it opens.
Key Functions of Sepals:
- Protection: Sepals primarily shield the delicate flower bud from environmental stressors such as harsh weather, pests, and physical damage.
- Support: After the flower opens, sepals often provide a supportive base for the petals.
- Photosynthesis (sometimes): While typically green, some sepals can perform photosynthesis, contributing to the flower's energy production.
Sepals vs. Petals
| Feature | Sepals | Petals |
|---|---|---|
| Typical Color | Green | Varied (often brightly colored) |
| Primary Function | Protection of bud, support of petals | Attracting pollinators |
| Collective Term | Calyx | Corolla |
| Position | Outermost whorl of the flower | Inner to the sepals |
Examples of Sepals
Look closely at any flower, and you'll likely see sepals. For example, in a rose, the small, green, leaf-like structures at the base of the flower are the sepals. Similarly, in a hibiscus flower, the green structures encircling the base of the colorful petals are the sepals.
In summary, sepals are essential components of a flower, mainly responsible for protecting the flower bud and supporting the petals. They are usually green and form the calyx, the outermost whorl of the flower.
