All Species in Alnus
- Alder (Alnus × fallacina)
- Alnus acuminata (Alnus acuminata)
- Alnus acuminata subsp. acuminata (Alnus acuminata subsp. acuminata)
- Alnus acuminata subsp. arguta (Alnus acuminata subsp. arguta)
- Alnus acuminata subsp. glabrata (Alnus acuminata subsp. glabrata)
- Alnus alnobetula (Alnus alnobetula)
- Alnus alnobetula subsp. alnobetula (Alnus alnobetula subsp. alnobetula)
- Alnus alnobetula subsp. crispa (Alnus alnobetula subsp. crispa)
- Alnus alnobetula subsp. fruticosa (Alnus alnobetula subsp. fruticosa)
- Alnus alnobetula subsp. sinuata (Alnus alnobetula subsp. sinuata)
- Alnus betulifolia (Alnus betulifolia)
- Alnus cordata subsp. cordata (Alnus cordata subsp. cordata)
- Alnus cordata subsp. neapolitana (Alnus cordata subsp. neapolitana)
- Alnus cremastogyne (Alnus cremastogyne)
- Alnus djavanshirii (Alnus djavanshirii)
- Alnus dolichocarpa (Alnus dolichocarpa)
- Alnus fauriei (Alnus fauriei)
- Alnus ferdinandi-coburgii (Alnus ferdinandi-coburgii)
- Alnus firma (Alnus firma)
- Alnus formosana (Alnus formosana)
- Alnus glutinosa subsp. antitaurica (Alnus glutinosa subsp. antitaurica)
- Alnus glutinosa subsp. barbata (Alnus glutinosa subsp. barbata)
- Alnus glutinosa subsp. betuloides (Alnus glutinosa subsp. betuloides)
- Alnus glutinosa subsp. glutinosa (Alnus glutinosa subsp. glutinosa)
- Alnus glutipes (Alnus glutipes)
- Alnus hakkodensis (Alnus hakkodensis)
- Alnus henryi (Alnus henryi)
- Alnus hirsuta (Alnus hirsuta)
- Alnus incana subsp. incana (Alnus incana subsp. incana)
- Alnus incana subsp. kolaensis (Alnus incana subsp. kolaensis)
- Alnus incana subsp. rugosa (Alnus incana subsp. rugosa)
- Alnus incana subsp. tenuifolia (Alnus incana subsp. tenuifolia)
- Alnus jorullensis (Alnus jorullensis)
- Alnus jorullensis subsp. jorullensis (Alnus jorullensis subsp. jorullensis)
- Alnus jorullensis subsp. lutea (Alnus jorullensis subsp. lutea)
- Alnus lanata (Alnus lanata)
- Alnus lusitanica (Alnus lusitanica)
- Alnus mairei (Alnus mairei)
- Alnus mandschurica (Alnus mandschurica)
- Alnus maritima subsp. georgiensis (Alnus maritima subsp. georgiensis)
- Alnus maritima subsp. maritima (Alnus maritima subsp. maritima)
- Alnus maritima subsp. oklahomensis (Alnus maritima subsp. oklahomensis)
- Alnus matsumurae (Alnus matsumurae)
- Alnus maximowiczii (Alnus maximowiczii)
- Alnus nitida (Alnus nitida)
- Alnus orientalis (Alnus orientalis)
- Alnus paniculata (Alnus paniculata)
- Alnus pendula (Alnus pendula)
- Alnus rohlenae (Alnus rohlenae)
- Alnus serrulatoides (Alnus serrulatoides)
- Alnus sieboldiana (Alnus sieboldiana)
- Alnus subcordata (Alnus subcordata)
- Alnus trabeculosa (Alnus trabeculosa)
- Alnus vermicularis (Alnus vermicularis)
- Alnus × elliptica (Alnus × elliptica)
- Alnus × hanedae (Alnus × hanedae)
- Alnus × hosoii (Alnus × hosoii)
- Alnus × mayrii (Alnus × mayrii)
- Alnus × peculiaris (Alnus × peculiaris)
- Alnus × pubescens (Alnus × pubescens)
- Alnus × suginoi (Alnus × suginoi)
- Arizona Alder (Alnus oblongifolia)
- European Alder (Alnus glutinosa)
- Gray Alder (Alnus incana)
- Green Alder (Alnus alnobetula subsp. suaveolens)
- Hazel Alder (Alnus serrulata)
- Italian Alder (Alnus cordata)
- Japanese Alder (Alnus japonica)
- Nepal Alder (Alnus nepalensis)
- Red Alder (Alnus rubra)
- Seaside Alder (Alnus maritima)
- White Alder (Alnus rhombifolia)