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Mature summer foliage and developing catkins of 'Imperialis'. Cut-leaf. Common Alder (Alnus glutinosa 'Imperialis'), a cultivar of the common Eurasian and North African. Alder, a very hardy, 20-30m tall, moisture-loving, deciduous tree 'Imperialis' has lobed leaves with narrow lobes that taper to a fine point and which are cut to well past halfway to the midrib of the leaf. The tree can be untidy when young but often develops into a neat conical form as it matures. alnus-2121htm'>Alnus. Betulaceae.