| Ballota |
Ballota nigra
| Bartsia |
Bartsia trixago
| Bellis |
Bellis microcephala
| Berberis |
Berberis hispanica
| Beta |
Beta maritima subsp. maritima
| Betula |
Betula pendula subsp. fontqueri
Betula pubescens
| Biarum |
Biarum arundanum
Biarum carratracense
| Bidens |
Bidens frondosa
Bidens pilosa
| Bifora |
Bifora radians
Bifora testiculata
| Biscutella |
Biscutella auriculata
Biscutella glacialis
| Blackstonia |
Blackstonia perfoliata subsp. perfoliata
| Borago |
Borago officinalis
| Brassica |
Brassica oleracea
Brassica repanda subsp. almeriensis
Brassica repanda subsp. latisiliqua
| Bunias |
Bunias erucago
| Bupleurum |
Bupleurum acutifolium
Bupleurum fruticosum
Bupleurum gibraltarium
Bupleurum lancifolium
Bupleurum ranunculoides subsp. bourgaei
Bupleurum spinosum
| Buxus |
Buxus sempervirens
