B
- Ballota nigra var. alba (I)
- Baptisia alba var. macrophylla (N)
- Baptisia australis var. australis (N)
- Baptisia tinctoria (N)
- Barbarea verna (I)
- Barbarea vulgaris (I)
- Bartonia virginica (N)
- Bassia hirsuta (I)
- Bassia scoparia (I)
- Beckmannia syzigachne (N)
- Belamcanda chinensis (I)
- Bellis perennis (I)
- Berberis × ottawensis (N)
- Berberis thunbergii (I)
- Berberis vulgaris (I)
- Berteroa incana (I)
- Besseya bullii (N)
- Betula alleghaniensis var. alleghaniensis (N)
- Betula alleghaniensis var. macrolepis (N)
- Betula lenta (N)
- Betula nigra (N)
- Betula papyrifera var. papyrifera (N)
- Betula pendula (I)
- Betula populifolia (N)
- Betula pubescens (N)
- Betula pubescens ssp. pubescens (I)
- Betula pumila var. pumila (N)
- Betula × purpusii (N)
- Bidens aristosa (N)
- Bidens beckii (N)
- Bidens bipinnata (N)
- Bidens cernua (N)
- Bidens connata (N)
- Bidens coronata (N)
- Bidens discoidea (N)
- Bidens frondosa (N)
- Bidens laevis (N)
- Bidens tripartita (N)
- Bidens vulgata (N)
- Bignonia capreolata (N)
- Blephilia ciliata (N)
- Blephilia hirsuta var. hirsuta (N)
- Boehmeria cylindrica (N)
- Boltonia asteroides var. recognita (N)
- Borago officinalis (I)
- Botrychium biternatum (N)
- Botrychium dissectum (N)
- Botrychium lanceolatum var. angustisegmentum (N)
- Botrychium matricariifolium (N)
- Botrychium multifidum (N)
- Botrychium oneidense (N)
- Botrychium simplex (N)
- Botrychium virginianum (N)
- Bouteloua curtipendula var. curtipendula (N)
- Bouteloua gracilis (N)
- Bouteloua hirsuta var. hirsuta (N)
- Brachyelytrum erectum (N)
- Brasenia schreberi (N)
- Brassica juncea (I)
- Brassica napus (I)
- Brassica nigra (I)
- Brassica oleracea (I)
- Brassica rapa var. amplexicaulis (I)
- Brassica rapa var. rapa (I)
- Brickellia eupatorioides var. corymbulosa (N)
- Brickellia eupatorioides var. eupatorioides (N)
- Bromus arvensis (I)
- Bromus briziformis (I)
- Bromus catharticus (I)
- Bromus ciliatus var. ciliatus (N)
- Bromus erectus (I)
- Bromus hordeaceus ssp. hordeaceus (I)
- Bromus inermis (N)
- Bromus inermis ssp. inermis var. inermis (I)
- Bromus kalmii (N)
- Bromus latiglumis (N)
- Bromus nottowayanus (N)
- Bromus pubescens (N)
- Bromus racemosus (I)
- Bromus secalinus var. secalinus (I)
- Bromus sterilis (I)
- Bromus tectorum (I)
- Broussonetia papyrifera (I)
- Browallia americana (I)
- Brunnera macrophylla (I)
- Buchnera americana (N)
- Buddleja davidii (I)
- Buglossoides arvensis (I)
- Bulbostylis capillaris ssp. capillaris (N)
- Bunias orientalis (I)
- Bupleurum lancifolium (I)
- Bupleurum rotundifolium (I)
- Butomus umbellatus (I)
- Buxus sempervirens (I)
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