What is ocrea?

Ocrea refers to a plant structure that provides support and protection, usually composed of fused stipules that encircle the stem at the base of a leaf. This characteristic is commonly observed in certain plant families, such as the buckwheat family (Polygonaceae).

In botanical terms, ocrea does not represent a flowering part, a method of reproduction, or a type of tree bark. Instead, it plays a protective role, helping to shield the plant's stem from herbivory and environmental factors. Understanding the structure’s function and the botanical classifications that include it can deepen one's appreciation for plant morphology, particularly how different structures contribute to a plant's survival and adaptation in various ecosystems.