Artemisia x 'Huntington' Artemisia californica
Artemisia ludoviciana Artemisia ludoviciana 'Silver Queen'
Artemisia pycnocephala Artemisia pycnocephala 'David's Choice'
Artemisia stelleriana Artemisia stelleriana 'Silver Brocade'
Asarina scandens 'Jewels' Asarina scandens 'Violet Glow'
Asarum canadense Asarum caudatum
Asarum shuttleworthii Asclepias asperula
Asclepias incarnata Asclepias incarnata 'Ice Ballet'
Asclepias subulata Asclepias syriaca
Asclepias tuberosa Asclepias tuberosa 'Gay Butterflies'
Asclepias tuberosa 'Hello Yellow' Asimina triloba
Asplenium platyneuron Asplenium rhizophyllum
Aster spp. Astilbe biternata
Astragalus crassicarpus Astrophytum asterias
Astrophytum capricorne Astrophytum myriostigma
Ateramnus lucidus Avicennia germinans
Baccharis x 'Starn' Baccharis centenial
Baccharis halimifolia Baccharis nummerifolia
Baccharis pilularis Baccharis pilularis 'Dodge Ely'
Baccharis pilularis 'Little Leaf' Baccharis pilularis 'Pigeon Point'
Baccharis pilularis 'Twin Peaks#2' Baccharis pilularis ssp. consanguinea
Baccharis sarothroides Baileya multiradiata
Baptisia 'Purple Smoke' Baptisia alba
Baptisia australis Baptisia bracteata
Baptisia pendula Baptisia spp.
Bartlettina sordida Bauhinia ramosissima
Berchemia polyphylla leioclada Bergerocactus emoryi
Beschorneria septemtrichonalis Betula alleghaniensis
Betula fontinalis Betula lenta
Betula nigra Betula nigra 'BNMTF (Dura-Heat™)'
Betula nigra 'Cully (Heritage®)' Betula nigra 'Little King (Fox Valley®)'
Betula nigra minor Betula papyrifera
Betula papyrifera var. commutata Betula populifolia
Betula populifolia 'Whitespire' Bidens ferulifolia 'Gold Marie'
Bidens ferulifolia 'Golden Goddess' Bignonia capreolata
Bignonia capreolata 'Jekyll' Bignonia capreolata 'Tangerine Beauty'
Blechnum spicant Boltonia asteroides 'Pink Beauty'
Boltonia asteroides 'Snowbank' Boltonia asteroides 'Snowflake'
Boltonia asteroides var. latisquama 'Nana' Borrichia arborescens
Botrychium virginianum Bouteloua gracilis
Bouvardia ternifolia Brahea aculeata
Brahea aculeata 'Elegans' Brahea armata
Brahea bella Brahea decumbens
Brahea edulis Brahea edulis x brandegeei
Brassavola nodosa Breynia nivosa
Breynia nivosa 'Nana' Brodiaea elegans
Buchloe dactyloides 'Sharps Improved' Bucida buceras
Bucida buceras 'Shady Lady' Bumelia anomala
Bumelia lanuginosa Bumelia tenax
Bunchosia lanceolata Buphthalmum salicifolium