Bachelor Button 

Balloon Flower 

Baptisia 

Beardtongue 

Bee Balm

Beeblossom

Belamcanda

Bellflower

Bergenia

Bethlehem Sage

Betony

Big Bluestem 

Black-Eyed Susan 

Blackberry Lily

Blanket Flower

Blazing Star 

Bleeding Heart 

Bloody Cranesbill

Blue-Eyed Grass 

Bluebells

Bluestar

Bluet

Brunnera 

Buddleia

Bugle Weed 

Bugloss

Burnett

Butterfly Bush

Butterfly Weed

Button Blazing Star