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Common Alder (Alnus glutinosa) in winter with maturing catkins. The catkins begin to develop in autumn by this time, a month after the shortest day, the longer male catkins are very evident. This very hardy, 20-30m tall, moisture-loving deciduous tree is native to Eurasia and North Africa. In many areas it has a reputation for being invasive. alnus-2121htm'>Alnus. Betulaceae.