It was collected in the marshland El Rocío, Spain. It has a very strong seed coat.
The attached pictures shows two pieces from different angle of the same species.
Thank you for the answers!
Looks like a big Cyperaceae, with a Plumatella statoblast present in the lower photo
OK Andy J. Green, or maybe Polygonum sp. or Rumex sp.
It´s posible Ranunculaceae?
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