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Common Alder (Alnus glutinosa)

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This picture shows the male catkins fully developed spreading their pollen. The smaller female catkins are above. The female catkins stay on the tree long after the seeds have been shed as cones. This time of year the tree can look full, even though no leaves are present, as it bears male and female catkins and old cones. The Alder is a common waterside tree. It can reach 20 metres. The bark is grey brown with shallow fissures and in spring it produces rounded leaves, often with a slight indent at the tip. Mature trees have open, slightly straggly crowns.

Added:
26th Feb 2006 by Diane Earl

Subjects:
Biology, Science

Key Stages:
Key Stage 1, Key Stage 2, Key Stage 3, Key Stage 4, Key Stage 4+

Keywords:
plant tree flower seed leaf

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