ocrea
/ˈɑkriə/
noun
- A sheath-like structure formed by the fusion of stipules, found at the base of the leaf stalk in certain plants, such as buckwheat and rhubarb.
- The ocrea is a key feature that distinguishes knotweed from similar-looking plants.
- Botany students examined the ocrea to identify the plant as a member of the buckwheat family.
- The ocrea on the rhubarb plant wraps around the stem like a small tube.