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Polygonaceae

6-Polygonum ocrea

[FMP-field: image]

A diagnostic vegetative feature of the Polygonaceae is the ocrea, which is a sheath formed at the base of each leaf. This example is Polygonum pennsylvanicum, common smartweed.

Taken by K. R. Robertson and D. L. Nickrent of plants in Cass County, Illinois.

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