| Betulaceae Gray, 1822 |
| Betuloideae Rich. ex Arn., 1832 |
| Carpinus L., 1753 |
| Carpinus americana Michx., 1803 |
| Carpinus americana var. tropicalis Donn. Sm., 1890 |
| Carpinus caroliniana Walter, 1788 |
| Carpinus caroliniana subsp. caroliniana Walter, 1788 |
| Carpinus caroliniana var. tropicalis (Donn. Sm.) Standl., 1920 |
| Carpinus tropicalis (Donn. Sm.) Lundell, 1939 |
| Carpinus tropicalis subsp. mexicana Furlow, 1987 |
| Carpinus tropicalis subsp. tropicalis (Donn. Sm.) Lundell, 1939 |
| Carpinus virginiana Mill., 1768 |
| Coryloideae Koehne, 1893 |
| Ostrya Scop., 1760 |
| Ostrya chisosensis Correll, 1965 |
| Ostrya guatemalensis (H.J.P. Winkl.) Rose, 1905 |
| Ostrya italica Spach, 1842 |
| Ostrya italica var. guatemalensis Winkl., 1904 |
| Ostrya mexicana Rose, 1905 |
| Ostrya virginiana (Mill.) K. Koch, 1873 |