Baccharis

Backhousia

Ballota

Baptisia

Begonia

Belamcanda

Berberidopsis

Berberis

Berchemia

Berchemiella

Bergenia

Betonica

Betula

Bignonia

Bischofia

Blechnum

Blepharocalyx

Blephilia

Bletilla

Boehmeria

Bolboschoenus

Borago

Bouteloua

Brachyelytrum

Brachyglottis

Briza

Broussonetia

Brunnera

Buddleja

Buglossoides

Bunium

Buphthalmum

Buxus