John Shaw / Dwarf willow (Salix herbacea) growing beside a small glacial stream with icebergs in Hare Fjord, Scoresby Sund, Greenland, August.
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Chris Mattison / Dwarf willow (Salix herbacea) in cultivation, Yorkshire, April.
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Chris Mattison / Dwarf willow (Salix herbacea) in cultivation, Yorkshire, April.
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Laurie Campbell / Dwarf / Least willow tree (Salix herbacea) growing between crack in boulder, Isle of Rum National Nature Reserve, Hebrides, Scotland, June
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Erlend Haarberg / Dwarf willow (Salix herbacea), Jotunheimen National Park, Norway, July.