Ochrea

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File:Ocreae of a Persicaria maculosa 2006-aug-10 Gothenburg Sweden.jpg
Ochrea on a redshank stem

An ochrea (Latin ocrea, greave or protective legging), also spelled ocrea, is a plant structure formed of stipules fused into a sheath surrounding the stem, and is typically found in the Polygonaceae.

In palms it denotes an extension of the leaf sheath beyond the petiole insertion.

References

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