While the provided references focus on leaf shapes, the question asks about leaf arrangements. Leaf arrangement, also known as phyllotaxy, refers to the pattern in which leaves are attached to a stem or branch. Three common leaf arrangements in dicots are: alternate, opposite, and whorled.
Here's a description of each:
- Alternate: This arrangement features one leaf per node, with the leaves appearing to alternate up the stem. Think of it as leaves spiraling (though often not in a perfect spiral) around the stem with one leaf at each point of attachment.
- Opposite: In an opposite arrangement, two leaves arise from the same node on the stem, positioned directly across from each other.
- Whorled: A whorled arrangement involves three or more leaves arising from a single node on the stem. This is less common than alternate or opposite arrangements.
| Leaf Arrangement | Description |
|---|---|
| Alternate | One leaf per node, leaves alternate up the stem. |
| Opposite | Two leaves per node, positioned directly across from each other. |
| Whorled | Three or more leaves arise from the same node. |
Understanding leaf arrangements is crucial for plant identification and classification. This feature, along with other characteristics, helps to differentiate between different plant species, particularly dicots.
