Wild Wonders of Europe / Bergman / Dwarf willow (Salix herbacea) and flowering plant, Thingeyjarsyslur, Iceland, June 2009 Licensed for exclusive book cover until 1 February 2015.

John Shaw / Dwarf willow (Salix herbacea) growing beside a small glacial stream with icebergs in Hare Fjord, Scoresby Sund, Greenland, August.

John Shaw / Alpine bearberry (Arctous alpina) and dwarf willow on tundra in autumn, Sydkapp (South Cape), Scoresby Sund, Greenland, September.

Melvin Grey / Whimbrel (Numenius phaeopus) adult at nest with eggs, in marshy area with with dwarf birch and willow, bilberry, bog rosemary , Mounio, Finland

Adrian Davies / Yezo dwarf willow (Salix nakamurana var. yezoalpina). In cultivation at botanic garden, Surrey, England. Occurs in Japan.

Chris Mattison / Dwarf willow (Salix herbacea) in cultivation, Yorkshire, April.

Chris Mattison / Dwarf willow (Salix herbacea) in cultivation, Yorkshire, April.

Laurie Campbell / Dwarf / Least willow tree (Salix herbacea) growing between crack in boulder, Isle of Rum National Nature Reserve, Hebrides, Scotland, June

Konstantin Mikhailov / Famous Denali HW area, a view from the upland plateau down to the valley of Susitna River with lakes, spruces (White spruce and Black Spruce) and the Fir (Abies). The land of moose, caribou and willo...

Konstantin Mikhailov / Famous Denali HW area, a typical landscape with lakes, White spruce (Picea glauca) and dwarf birches on upland plateau of Alaska Range. The land of caribou, willow grouse and moose. Denali HighWay (R...

Konstantin Mikhailov / Famous Denali HW area, a typical landscape with White spruce (Picea glauca) on upland plateau of Alaska Range. The land of caribou, willow grouse and moose. Denali HighWay (Road 8) leading to Denali...

Bruno D'Amicis / Dwarf Willow (Salix herbacea) foliage. Western Tatras, Slovakia, June.

Yva Momatiuk & John Eastcott / Dall's Sheep (Ovis dalli) sub-adult ram nibbling on Dwarf Willow (Salix herbacea), Denali National Park, Alaska

Konstantin Mikhailov / Dwarf polar willow (Salix sp) in the mountainous tundra of Altai Region, Russia, June, 3000 m

Eric Baccega / Arctic willow (Salix arctica) flowering, Baffin Island, Nunavut, Canada, August

Eric Baccega / Arctic willow (Salix arctica) flowering, Baffin Island, Nunavut, Canada, August

Eric Baccega / Arctic willow (Salix arctica) flowering on rocks, Baffin Island, Nunavut, Canada, August 2010

Konstantin Mikhailov / Willow grouse (Lagopus lagopus) portrait standing in Dwarf Birch tundra, in Denali NP, Alaska, North America, September

Wild Wonders of Europe / D'Amicis / Mat of Dwarf willow treees (Salix herbacea) saddle in the Liptovske kopi, Western Tatras, Carpathian Mountains, Slovakia, June 2009

Elio Della Ferrera / Dwarf willow plants {Salix herbacea} leaves and flowers, Tessa Regional Park, Alps, Italy

Yva Momatiuk & John Eastcott / Dwarf Birch (Betula nana) and isolated Black Spruce (Picea mariana) trees with lichens and berry bushes in colorful tundra in autumn, Denali National Park, Alaska

Niall Benvie / Bog / Northern bilberry {Vaccinium uliginosum} berries amongst Dwarf willow {Salix herbacea} Norway

Yva Momatiuk & John Eastcott / Dwarf Birch (Betula nana) dwarf willow, lichens and berry bushes surround small rocky ridge containing good fox denning sites near Dalton Highway, autumn afternoon, North Slope, arctic Alaska

Yva Momatiuk & John Eastcott / Dwarf Birch (Betula nana) dwarf willow, lichens and berry bushes surround small rocky ridge containing good fox denning sites near Dalton Highway, autumn afternoon, North Slope, arctic Alaska

Erlend Haarberg / Dwarf willow (Salix herbacea), Jotunheimen National Park, Norway, July.