Probably an osier plant, Horeb
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The photograph on this page of Probably an osier plant, Horeb by Humphrey Bolton as part of the Geograph project.
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Image: © Humphrey Bolton Taken: 26 Apr 2019
This is alongside a track that is a public footpath, near a stream. At the time I thought that it looked like a bamboo plant, but it has smooth stems without nodules, and anyway an osier seems more likely.