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The sal willow (Salix caprea), also called palm willow or catkin willow is a very common shrub or tree in Europe and western Asia to the far north, which only does not thrive in the warm south. As a very early bloomer, the sal willow plays an important role in the ecosystem as a food provider for bees and delights people after long winters with the well-known willow or palm catkins as the first messengers of the approaching spring. Wood and especially the bark of the tree contain tannins and salicin, which was known since ancient times as an antipyretic and analgesic natural medicine and spread worldwide as acetylsalicylic acid under the name aspirin. In the past, the wood of salt willows was used in many ways for matchsticks, wooden shoes, prostheses, boxes and poles, but today the wood is rarely found.