Species by Genus: Alnus
- Alnus acuminata
- Alnus acuminata var. jorullensis
- Alnus acutissima
- Alnus barbata
- Alnus boshia
- Alnus castaneifolia
- Alnus ferruginea
- Alnus ferruginea var. aliso
- Alnus glutinosa
- Alnus glutinosa subsp. barbata
- Alnus glutinosa var. barbata
- Alnus glutinosa var. floribunda
- Alnus incana
- Alnus incana var. rubra
- Alnus japonica
- Alnus jorullensis
- Alnus jorullensis var. acuminata
- Alnus jorullensis var. ferruginea
- Alnus jorullensis var. mirbelii
- Alnus lanceolata
- Alnus lindenii
- Alnus mairei
- Alnus mirbelii
- Alnus nepalensis
- Alnus nitida
- Alnus oblongata
- Alnus oregana
- Alnus rubra
- Alnus rubra f. pinnatisecta
- Alnus rubra var. pinnatisecta
- Alnus rugosa
- Alnus sibirica
- Alnus spachii
- Alnus spp.
- Alnus trabeculosa