- Basil Balm
- Bearded Meadow Parsnip
- Beardtongue, Hairy
- Beardtongue, White
- Bedstraw, Forest or Licorice
- Bedstraw, Purple
- Bedstraw, Yellow
- Bee Balm
- Beechdrops
- Beggar-ticks, European
- Beggar-ticks, Nodding
- Bellflower, Creeping
- Bellflower, Marsh
- Bellflower, Tall
- Bellwort, Large-flowered
- Bellwort, Mountain
- Bellwort, Perfoliate
- Bellwort, Sessile-leaved
- Bergamot
- Biennial Gaura
- Bindweed, Black
- Bindweed, Field
- Bindweed, Hedge
- Bindweed, Shale Barren
- Bindweed, Upright
- Birdsfoot Trefoil
- Bittercress, Hairy
- Black-eyed Susan
- Black Huckleberry
- Black Medick
- Black Mustard
- Blackhaw
- Blazing Star, Appalachia or Turgid
- Blazing Star, Grass-leaved
- Blazing Star, Rough
- Blazing Star, Spiked or Dense
- Blazing Star, Wand or Grass-Leaved
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- Bloodroot
- Blue Cohosh
- Blue Curls
- Blue-eyed Grass, Slender
- Blue-eyed Grass, Stout
- Blue Flag, Larger
- Bluets
- Boneset
- Boneset, False
- Boneset, Round-leaved
- Boneset, Upland
- Bouncing Bet
- Bowman's Root
- Bramble
- Branched Bur-reed
- Brown-eyed Susan
- Bugbane, Black
- Bugbane, Mountain
- Bugle or Carpet-bugle
- Bunchberry
- Bunchflower, Appalachian or Mountain
- Bunchflower, Virginia
- Bur Cucumber
- Bur-Marigold, Nodding
- Bush-clover, Downy Trailing
- Bush-clover, Hairy
- Bush-clover, Shrubby
- Bush-clover, Smooth Trailing
- Bush-clover, Wandlike
- Butter-and-eggs
- Buttercup, Bulbous
- Buttercup, Common
- Buttercup, Hispid
- Buttercup, Swamp
- Butterfly Pea
- Butterfly Weed
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