• Basteria Houttuyn, 1776 (unaccepted) [Family: Asteraceae]
• Basteria P. Miller, 1755 accepted as Calycanthus Linnaeus, 1759 [Family: Calycanthaceae]
• Bipteria Kovaljova, Zubtchenko & Krasin, 1983
• Biscoia † accepted as Briscoia Walcott, 1924 † [Family: Dikelocephalidae]
• Biscoia Salmon, 1962 (uncertain) [Family: Hypogastruridae]
• Bisetaria Karl, 1943 (uncertain) [Family: Diptera (awaiting allocation)]
• Bisetaria Van Tieghem, 1902 (uncertain) [Family: Ochnaceae]
• Bishofia Kazantseva, 1968 † (uncertain)
• Bishovia R.M. King & H. Robinson, 1978
• Biskria Puton, 1874 (uncertain)
• Bispora Corda, 1837 [Family: Ascomycota incertae sedis]
• Bispora Fuckel, 1870 accepted as Bisporella P.A. Saccardo, 1884 [Family: Helotiales incertae sedis]
• Bistolida Cossmann, 1920
• Bistoma Reich, 1801 (unaccepted)
• Bistonina Robbins, 2004
• Bistorta (Linnaeus) Scopoli, 1754
• Bistota Roewer, 1927
• Bistylia Tenison-Woods, 1878 accepted as Guynia Duncan, 1873
• Bitteria Börner, 1912 (uncertain)
• Bostria Scudder, 1901 (uncertain)
• Pistoria Hemming, 1964
• Ristoria Garassino, Pasini, De Angeli & Charbonnier, 2012 †