Genus Betula (114):

• Yellow birch (Betula alleghaniensis)
• Yellow birch (Betula alleghaniensis var. alleghaniensis)
• Blue birch (Betula × caerulea)
• Blue birch (Betula caerulea var. caerulea)
• Mountain paper birch (Betula cordifolia)
• Dutilly's birch (Betula × dutillyi)
• Resin birch (Betula glandulosa)
• Sweet birch (Betula lenta)
• Virginia roundleaf birch (Betula lenta f. uber)
• Monarch birch (Betula maximowicziana)
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Famili Betulaceae (296):

• Italian alder (Alnus cordata)
• European alder (Alnus glutinosa)
• Manchurian Alder (Alnus hirsuta)
• Gray alder (Alnus incana)
• Japanese alder (Alnus japonica)
• Seaside alder (Alnus maritima)
• Nepal alder (Alnus nepalensis)
• Arizona alder (Alnus oblongifolia)
• White alder (Alnus rhombifolia)
• Red alder (Alnus rubra)
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