• Basa Distant, 1905 (uncertain)
• Baspa Moore, 1882
• Basta Oken, 1815 accepted as Ianthella Gray, 1869
• Basta Pallas, 1766
• Bosea Das et al., 1996 [Family: Bradyrhizobiaceae]
• Bosea He & Qian, 1979 † accepted as Bosedinia He, 1984 † [Family: Peridiniaceae]
• Bosea Linnaeus, 1753 [Family: Amaranthaceae]
• Bosea S.C. Srivastava, 1975 † (unaccepted) [Family: Pteridospermopsida (awaiting allocation)]
• Busea Miquel, 1858 (uncertain)
• Casea Newberry, 1853 † (uncertain) [Family: Plantae (awaiting allocation)]
• Casea Williston, 1910 † [Family: Caseidae]
• Lasea Gray, 1842 accepted as Lasaea Brown, 1827
• Sasea Hall, 1867 accepted as Lasaea Brown, 1827