Equisetum palustre
Marsh Horsetail
Mýrelfting


Þingvellir

If you can excuse the rather prominent Geum rivale in the middle of the picture, there are several fine examples of Marsh Horsetail in the picture. They are the ones with the bright green color and very short branches. The horsetail with the long branches are Equisetum pratense - Shady Horsetail.

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