Alder

Alnus glutinosa is a medium-sized, short-lived tree in the Betulaceae family. It is found in wet habitats and is associated with the nitrogen-fixing bacterium Frankia alni, allowing it to thrive in nutrient-poor soils. The tree has short-stalked, rounded leaves and separate male and female catkins. Its small, cone-like fruits produce seeds dispersed by wind and water. The species is native to Europe, southwest Asia, and northern Africa, and has been recorded in regions such as Newfoundland, Portugal, Denmark, Norway, and others. First described in 1790, it is widely distributed across both natural and introduced ranges.