| Bealia mexicana Scribn., 1890 |
| Bealia speciosa (Vasey) Beal, 1896 |
| Beckeria Bernh., 1800 |
| Beckeria (Bernh.) Asch., 1864 |
| Beckeropsis Fig. & De Not., 1853 |
| Bellardiochloa Chiov., 1929 |
| Bennetia Raf., 1830 |
| Bennetia juncea Raf. ex B.D. Jacks., 1893 |
| Berchtoldia J. Presl, 1830 |
| Berchtoldia bromoides J. Presl, 1830 |
| Berchtoldia holciformis (Kunth) E. Fourn., 1886 |
| Berchtoldia junciformis Hemsl., 1895 |
| Berchtoldia oplismenoides E. Fourn., 1886 |
| Biatherium Desv., 1831 |
| Bicknelliana Hitchc. & Chase, 1910 |
| Bifaria (Hack.) Kuntze, 1898 |
| Blepharidachne Hack., 1887 |
| Blepharidachne bigelovii (S. Watson) Hack., 1889 |
| Blepharochloa Endl., 1840 |
| Blepharoneuron Nash, 1898 |