Betulaceae | ** |
Betula alnus var. americana
| C.F. Ludw. | Neuere Wilde Baumz. 8 | 1783 |
Betulaceae | |
Betula alnus var. crispa
| (Aiton) Michx. | Fl. Bor.-Amer. 2: 181 | 1803 |
Betulaceae | |
Betula alnus var. glutinosa
| L. | Sp. Pl. 2: 983 | 1753 |
Betulaceae | ** |
Betula alnus var. glutinosa
| C.F. Ludw. | Neuere Wilde Baumz. 8 | 1783 |
Betulaceae | |
Betula alnus var. incana
| L. | Sp. Pl. 2: 983 | 1753 |
Betulaceae | ** |
Betula alnus var. incana
| C.F. Ludw. | Neuere Wilde Baumz. 8 | 1783 |
Betulaceae | |
Betula alnus var. rugosa
| Du Roi | Diss. Observ. Bot. 32 | 1771 |
Betulaceae | ** |
Betula alnus var. rugosa
| C.F. Ludw. | Neuere Wilde Baumz. 8 | 1783 |
Betulaceae | |
Betula alnus var. serrulata
| (Aiton) Michx. | Fl. Bor.-Amer. 2: 181 | 1803 |