B

1. Babingtonia - 2

2. Bahiella - 2

3. Baimashania - 2

4. Bakerophyton - 2

5. Bakoa - 2

6. Balakata - 2

7. Balfourodendron - 2

8. Balizia - 2

9. Baltimora - 2

10. Bambekea - 2

11. Bampsia - 2

12. Barbellopsis - 2

13. Barclaya - 2

14. Barkhausia - 2

15. Barnardia - 2

16. Barnebya - 2

17. Bartholina - 2

18. Bartramiopsis - 2

19. Bassecoia - 2

20. Bathmium - 2

21. Batis - 2

22. Beccariophoenix - 2

23. Bechium - 2

24. Beckmannia - 2

25. Beclardia - 2

26. Beesia - 2

27. Bejaranoa - 2

28. Belairia - 2

29. Bellonia - 2

30. Benoicanthus - 2

31. Bentinckia - 2

32. Berberidopsis - 2

33. Berlinianche - 2

34. Berylsimpsonia - 2

35. Bescherellia - 2

36. Billburttia - 2

37. Billia - 2

38. Bischofia - 2

39. Bishovia - 2

40. Blakeanthus - 2

41. Blechnopsis - 2

42. Blennodia - 2

43. Blepharizonia - 2

44. Blepharocarya - 2

45. Blepharoneuron - 2

46. Blyttia - 2

47. Bobgunnia - 2

48. Bocagea - 2

49. Bolandia - 2

50. Bolandra - 2

51. Bolax - 2

52. Bolbostemma - 2

53. Bombycidendron - 2

54. Bombycilaena - 2

55. Bongardia - 2

56. Boniodendron - 2

57. Bonplandia - 2

58. Boophone - 2

59. Borassodendron - 2

60. Boreava - 2

61. Bostrychanthera - 2

62. Botryarrhena - 2

63. Bouchardatia - 2

64. Bournea - 2

65. Bowenia - 2

66. Bowringia - 2

67. Brachyactis - 2

68. Brachychloa - 2

69. Brachylophon - 2

70. Brachynema - 2

71. Brachyodon - 2

72. Brachypodium - 2

73. Brachysola - 2

74. Bracisepalum - 2

75. Bradburia - 2

76. Bradlea - 2

77. Brainea - 2

78. Brassiophoenix - 2

79. Breea - 2

80. Brenania - 2

81. Brexiella - 2

82. Brighamia - 2

83. Bromeliophila - 2

84. Bromopsis - 2

85. Brothera - 2

86. Bruinsmia - 2

87. Bryantiella - 2

88. Bryoceuthospora - 2

89. Bryochenea - 2

90. Bryomanginia - 2

91. Bryonoguchia - 2

92. Bryonorrisia - 2

93. Bryotestua - 2

94. Bryowijkia - 2

95. Bucephalandra - 2

96. Buchholzia - 2

97. Buchnerodendron - 2

98. Buckiella - 2

99. Buckinghamia - 2

100. Buckollia - 2

101. Bungea - 2

102. Burkea - 2

103. Burnettia - 2

104. Butomus - 2

105. Byrsophyllum - 2