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An ochrea (
An ochrea (Latin
Latin ( or ) is a classical language belonging to the Italic languages, Italic branch of the Indo-European languages. Latin was originally spoken by the Latins (Italic tribe), Latins in Latium (now known as Lazio), the lower Tiber area aroun ...
''ocrea'', greave or protective legging), also spelled ocrea, is a plant structure formed of stipule
In botany, a stipule is an outgrowth typically borne on both sides (sometimes on just one side) of the base of a leafstalk (the petiole (botany), petiole). They are primarily found among dicots and rare among monocots. Stipules are considered part ...
s fused into a sheath surrounding the stem, and is typically found in the Polygonaceae
The Polygonaceae are a Family (biology), family of flowering plants known Common name, informally as the knotweed family or smartweed—buckwheat family in the United States. The Botanical name, name is Basionym, based on the genus ''Polygonum'', ...
.
In palms it denotes an extension of the leaf sheath beyond the petiole insertion.
References
Plant morphology {{Plant-morphology-stub