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Salix (willows; family Salicaceae) A genus of trees, some of them large, and shrubs, many of which are dwarf alpine or Arctic species. The catkin scales are untoothed (they are toothed in Populus), there are only 2–5 stamens, and nectaries are present in the flowers which (unlike those of Populus) are insect-pollinated. The buds are enveloped by a single outer scale (there are several in Populus). S. alba var. caerulea is the best tree from which to make cricket bats. There are about 300 species, most of them northern temperate or Arctic, but with a few tropical and southern temperate outliers.

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