Alnus
genus of plants
- (category), Alnus cordata, Italian Alder
- (category), Alnus firma, Japan Alder
- (category), Alnus formosana, Formosan Alder
- (category), Alnus glutinosa, Common Alder
- (category), Alnus hirsuta, Manchurian Alder
- (category), Alnus incana, Grey Alder
- (category), Alnus jorullensis, Mexican Alder
- (category), Alnus maritima, Seaside Alder
- (category), Alnus maximowiczii,
- (category), Alnus nitida, Himalayan Alder
- (category), Alnus rhombifolia, White Alder
- (category), Alnus rubra, Red Alder
- (category), Alnus serrulata, Hazel alder
- (category), Alnus trabeculosa,
- (category), Alnus viridis, Green Alder
- (category), Alnus × spaethii,
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Alnus firma leaves
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Alnus glutinosa underwater roots
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Alnus hirsuta leaves
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Alnus incana cones
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Alnus incana bark
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Alnus maritima leaves
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Alnus rhombifolia leaves
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Alnus rubra catkins
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Alnus serrulata catkins
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Alnus serrulata leaves
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Alnus viridis cones