Crack Willow - Salix fragilis

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This fast growing tree can live up to 1000 years, though more typically lives to 200. 

The Crack Willow has narrow, toothed leaves that are slightly shiny above and blue-green on the underside. The tree gets its name from the sharp 'crack' made by snapping its twigs. 

A light wood, it was traditionally used to make small sailing boats.
Photo used under Creative Commons from Matt Lavin