| Bells of Ireland |
Molucella laevis |
 |
| Betony |
Stachys (Betonica) officinalis |
 |
| Bigroot Cranesbill |
Geranium macrorrhizum |
|
| Bird of Paradise |
Caesalpinia gilliesii |
 |
| Bird of Paradise |
Strelitzia nicolae |
|
| Bird's Eyes |
Gilia tricolor |
|
| Bird's Foot Trefoil |
Lotus corniculatus |
|
| Bistort |
Persicaria superba (orientale) |
|
| Bitter Milkwort |
Polygala amara |
|
| Bitter Root (many) |
Lewisia |
|
| Black-eyed Geranium |
Geranium ocellatum |
 |
| Black Eyed Susie |
Thunbergia alata |
|
| Black False Helleborine |
Veratrum nigrum |
 |
| Black Horehound |
Ballota nigra |
|
| Black Meddick |
Medicago lupulina |
 |
| Black Rampion |
Phyteuma nigrum |
|
| Black Swallow-wort |
Vincetoxicum nigrum |
|
| Blackberry |
Rubus fruticosus |
|
| Blackberry Lily |
Belamcanda chinensis |
|
| Black-eyed Susan |
Rudbeckia hirta |
|
| Bladder Campion |
Silene vulgaris |
|
| Bladder Senna |
Colutea x media |
|
| Bladdernut |
Staphylea trifolia |
|
| Bladderpod |
Physaria didymocarpa |
|
| Blanket Flower |
Gaillardia |
|
| Bleeding Heart (many) |
Dicentra |
|
| Bleeding Heart |
Dicentra spectabilis |
|
| Bloodroot |
Sanguinaria canadensis |
|
| Bloody Cranesbill |
Geranium sanguineum |
|
| Blue Angel's Trumpet |
Iochroma australe |
|
| Blue Berry Ginger |
Alpinia coerulea |
|
| Blue Chrysanthemum |
Heteropappus meyendorfii |
|
| Blue Corn Lily |
Aristea ecklonii |
|
| Blue Daisy (many) |
Felicia |
|
| Blue Daisy |
Felicia heterophylla |
|
| Blue Daisy |
Felicia uliginosa |
|
| Blue Ginger |
Dichorisandra thyrsiflors |
|
| Blue Hibiscus |
Alyogyne huegelii |
|
| Blue Lace Flower |
Didiscus caerulea |
|
| Blue Marguerite |
Felicia |
|
| Blue Mist Shrub |
Caryopteris x clandonensis |
|
| Blue Oxalis |
Parochetus communis |
|
| Blue Pasithea |
Pasithea caerulea |
|
| Blue Passionflower |
Passiflora caerulea |
|
| Blue Pea |
Psoralea |
|
| Blue Pimpernel |
Anagallis monellii |
|
| Blue Poppy (many) |
Meconopsis |
|
| Blue Poppy |
Meconopsis horridula |
|
| Blue Poppy |
Meconopsis betonicifolia (alba) |
|
| Blue Star Creeper |
Isotoma |
|
| Blue Star Creeper (many) |
Pratia |
|
| Blue Star Creeper |
Pratia |
|
| Blue Star Creeper |
Pratia angulata |
|
| Blue Star Creeper |
Solenopsis (Laurentia) axillaris |
|
| Blue Trumpet Vine |
Thunbergia grandiflora |
|
| Blue Water Lily |
Nymphaea capensis |
|
| Bluebell |
Scilla (Hyacinthina) non-scripta |
|
| Bluebell Creeper |
Sollya fusiformis (heterophylla) |
|
| Blue-eyed Grass |
Sisyrinchium angustifolium |
|
