ocrea

A sheath formed at the node of a stem by the fusion of two stipules, found in many plants of the family Polygonaceae, such as rhubarb.

In botany, a sheathing stipule, or a pair of stipules united into a sheath around the stem, like a legging or the leg of a boot; also sometimes, in mosses, the thin sheath around the seta, terminating the vaginula.

In zoology, a sheath; an investing part like or likened to an ocrea of a plant. Also, erroneously, ochrea.

See ochrea.

A sheath around a plant stem forming from the stipule of a leaf and extending above the point of insertion of the leaf.