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About Alder (Alnus)
Alder is the common name for a genus of flowering plants (Alnus) within the birch family, Betulaceae. This genus includes approximately 35 species.
Taxonomy and Nomenclature
- Scientific Name: Alnus
- Common Name: Alder
- Family: Betulaceae (birch family)
Distribution and Habitat
- The common alder (Alnus glutinosa) is native to most of Europe and southwest Asia.
- Alder is native to Britain and found throughout Europe as far as Siberia.
- Common alder (Alnus glutinosa) is the most common tree in riparian forests.
Morphological Characteristics and Growth Habits
- The common alder (Alnus glutinosa) is a tree species.
- Alder trees can be conical-shaped.
- They can reach a height of 20 meters.
- Alder rarely grows to more than 20 meters or lives longer than 150 years.
- It grows quickly and is short-lived.
Ecological Role
- Alder improves soil fertility through its ability to fix nitrogen from the air.
Interactions with Other Organisms
- All alder species (Alnus spp.) are threatened by a lethal disease first discovered in Britain in 1993. The text doesn't specify the causal agent.