Cotton-grass either common or hare's-tail

Cotton-grass either common or hare's-tail

Observation - Cotton-grass either common or hare's-tail - UK and Ireland. Description: This is either common or hare's-tail cotton grass as these are the only 2 on the site, anyone know which one?

This is either common or hare's-tail cotton grass as these are the only 2 on the site, anyone know which one?