Arethusa 
Argentina 
Argyrothamnia 
Arisaema 
Aristida 
Aristolochia 
Argemone 
Arnica 
Arnoseris 
Aronia 
Arrhenatherum 
Artemisia 
Aruncus 
Arundinaria 
Arundo 
Asarum 
Asclepias 
Asclepias 
Asclepiodora 
Ascyrum 
Asimina 
Asparagus 
Asperugo 
Asperula 
Aspicarpa 
Aspidium 
Asplenium 
Asprella 
Astephanus 
Aster 
Aster 209, 
Astilbe 
Astragalus 114, 118, 
Astrophyllum 
Ataenia 
Atamisquea 
Atamosco 
Athysanus 
Atragene 
Atrichoseris 
Atriplex 
Audibertia 
Avena 
Avicennia 
Ayenia 
Azalea 
Azaleastrum 
Azolla 
Baccharis 
Baeria 
Paeria 
Bahia 
Baileya 
Baldwinia 
Ballota 
Balsamorrhiza 
Baptisia 
Barbarea 
Bartlettia 
Bartonia 
Bartsia 
Batis 
Batodendron 
Batrachium 
Bebbia 
w=—NNNNNN 
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242 
Beckmannia 
Beckwithia 
Bejaria 
Belamacanda 
Bellinia 
Bellis 
Beloperone 
Benzoin 
Berberis 
Berchemia 
Bergia 
Berginia 
Berlandiera 
Bernardia 
Berteroa 
Berula 
Betonica 
Betula 
Bicuculla 
Bidens 
Bifora 
Bigelovia 
Bignonia 
Biolettia 
Blechnum 
Blennosperma 
Blepharoneuron 
Blepharipappus 
Blepharipappus 
Blepharizonia 
Blephilia 
Bletia 
Blitum 
Bloomeria 
Bocconia 
Boehmeria 
Boerhaavia 
Boisduvalia 
Bolandra 
Bolelia 
Boltonia 
Borago 
Borreria 
Borrichia 
Boschniakia 
Botrychium 
Bouchea 
Bouchetia 
Bourdonia 
Bourreria 
Bouteloua 
Bouvardia 
Bowlesia 
Boykinia 
Brachyactis 
Brachychaeta 
Brachyelytrum 
Bradburya 
Bradburva 
Brandegea 
Brasenia 
Brassica 
Brauneria 
Braya 
Brazoria 
Brevoortia 
205, 
Breweria 
Brickellia 
Brintonia 
Brittonamra 
Brittonastrum 
Briza 
Brodiaea 
Bromus 
Brongniartia 
Broussonetia 
Brunnichia 
Bryanthus 
Bryophyllum 
Buchloe 
Buchnera 
Buckleya 
Buda 
Buddleia 
Bulbilis 
Bumelia 
Bupleurum 
Burmannia 
Burrielia 
Bursa 
Bursera 
Butneria 
Byrsonimia 
Cabomba 
Cacalia 
Cacaliopsis 
Cactus 
Caesalpinia 
Cakile 
Colamagrostis 
Calamagrostis 
Calamintha 
Calamovilia 
Calandrinia 
Calceolaria 
Calla 
Calliandra 
Callicarpa 
Callirhoe 
Callitriche 
Calluna 
Calochortus 
Calophanes 
Calopogon 
Caltha 
Calycadenia 
Calycanthus 
Calycocarpum 
Calycoseris 
Calydora 
Calypso 
Calyptranthes 
Calyptridium 
Calyptrocarpus 
Camassta 
Camelina 
Cammarum 
Campanula 
Campsis 
Camptosorus 
Campulosus 
