Acer

Acer shirasawanum (Shirasawa Maple)
Acer shirasawanum 'Aureum' (Golden Fullmoon Maple)
Acer spicatum (Mountain Maple )
Acer tataricum (Tatarian Maple )
Acer tataricum subsp. ginnala (Amur Maple)
Acer tataricum subsp. ginnala 'Emerald Elf' (Emerald Elf Amur Maple)
Acer tegmentosum (Manchurian Stripebark Maple )
Acer triflorum (Three Flowered Maple)
Acer truncatum (Purpleblow Maple )
Acer velutinum (Velvet Maple)

Actinidia

Actinidia kolomikta (Kolomikta Actinidia )

Adansonia

Adansonia digitata (Baobab)

Adenium

Adenium obesum (Desert Rose )

Adenocarpus

Adenocarpus decorticans (Silver Broom )

Aesculus

Aesculus californica (California Buckeye )
Aesculus × carnea (Red Flowering Horsechestnut)
Aesculus × carnea 'O'Neill Red' (O'Neill Red Horsechestnut )
Aesculus chinensis (Chinese Horsechestnut)
Aesculus flava (Yellow Buckeye )
Aesculus glabra (Ohio Buckeye )
Aesculus glabra var. arguta (Texas Buckeye )
Aesculus hippocastanum (Horsechestnut)
Aesculus hippocastanum 'Baumannii' (Double Horsechestnut )
Aesculus parviflora (Bottlebrush Buckeye)
Aesculus pavia (Red Buckeye)
Aesculus pavia 'Humilis' (Dwarf Red Buckeye)
Aesculus sylvatica (Painted Buckeye )

Agave

Agave colorata (Mescal Ceniza )
Agave macroacantha (Black-spinned Agave)
Agave ocahui (Ocahui Agave)
Agave parryi (Parry's Agave)
Agave shawii (Shaw's Agave)

Ailanthus

Ailanthus altissima (Tree of Heaven )

Akebia

Akebia quinata (Five-leaf Akebia )

Albizia

Albizia julibrissin (Silk Tree )
Albizia julibrissin 'Summer Chocolate' (Summer Chocolate Silk Tree)

Aleurites

Aleurites moluccanus (Candelnut)
Aleurites rockinghamensis (Candelnut)

Alnus

Alnus alnobetula (Circumpolar alder group )
Alnus alnobetula subsp. sinuata (Sitka Alder )
Alnus alnobetula subsp. crispa (American Green Alder)
Alnus cordata (Italian Alder)
Alnus glutinosa (Common Alder )
Alnus glutinosa 'Imperialis' (Imperialis Black Alder)
Alnus glutinosa 'Laciniata' (Cutleaf Alder )
Alnus incana subsp. rugosa (Speckled Alder )
Alnus incana subsp. tenuifolia (Thinleaf Alder )
Alnus japonica (Japanese Alder)
Alnus rhombifolia (White Alder)
Alnus rubra (Red Alder )
Alnus rubra f. pinnatisecta (Cutleaf Red Alder)
Alnus sinuata (Sitka Alder)

Amelanchier

Amelanchier alnifolia (Western Serviceberry )
Amelanchier alnifolia 'Regent' (Regent Serviceberry )
Amelanchier canadensis (Shadblow )
Amelanchier × grandiflora (Apple Serviceberry)
Amelanchier × grandiflora Autumn Brilliance® (Autumn Brilliance Serviceberry)
Amelanchier × grandiflora 'Forest Prince' (Forest Prince Serviceberry)
Amelanchier laevis (Allegheny Serviceberry )

Amorpha

Amorpha nana (Dwarf Wild Indigo )

Ampelopsis

Ampelopsis brevipedunculata (Porcelain Berry )
Ampelopsis brevipendiculata 'Elegans' (Elegans Porcelain Berry )

Andromeda

Andromeda polifolia (Bog Rosemary)

Aralia

Aralia elata (Angelica Tree )
Aralia elata 'Variegata' (Variegated Angelica Tree)

Araucaria

Araucaria araucana (Monkey Puzzle Tree )

Arbutus

Arbutus menziesii (Pacific Madrone )
Arbutus unedo (Strawberry Tree )

Arctostaphylos

Arctostaphylos × 'Austin Griffiths' (Austin Griffiths Manzanita)
Arctostaphylos 'White Lanterns' (White Lanterns Manzanita)
Arctostaphylos andersonii (Santa Cruz Manzanita )
Arctostaphylos bakeri subsp. bakeri (Baker Manzanita)
Arctostaphylos bakeri subsp. bakeri 'Louis Edmunds' (Louis Edmunds Manzanita)
Arctostaphylos canescens (Hoary Manzanita )
Arctostaphylos columbiana (Hairy Manzanita)
Arctostaphylos confertiflora (Santa Rosa Island Manzanita)
Arctostaphylos densiflora (Sonoma Manzanita )
Arctostaphylos densiflora 'Howard McMinn' (Howard McMinn Manzanita)
Arctostaphylos edmundsii (Little Sur Manzanita)
Arctostaphylos hookeri (Hooker's Manzanita )
Arctostaphylos hookeri subsp. franciscana (Franciscan Manzanita)
Arctostaphylos insularis (Island Manzanita)
Arctostaphylos manzanita (Parry Manzanita )
Arctostaphylos manzanita 'St. Helena' (St. Helena Manzanita)
Arctostaphylos montaraensis (Montara Manzanita)
Arctostaphylos nevadensis (Pinemat Manzanita)
Arctostaphylos pajaroensis (Pajaro Manzanita)
Arctostaphylos pajaroensis 'Bretts Beauty' (Brett's Beauty Manzanita)
Arctostaphylos patula (Green Manzanita )
Arctostaphylos pumila (Sandmat Manzanita )
Arctostaphylos pungens (Ponitleaf Manzanita )
Arctostaphylos refugioensis (Refugio Manzanita)
Arctostaphylos rudis (Shag Bark Manzanita )
Arctostaphylos tomentosa (Wolly Manzanita )
Arctostaphylos uva-ursi (Kinnikinnik )
Arctostaphylos uva-ursi 'Massachusetts' (Massachusetts Kinnikinnik )
Arctostaphylos uva-ursi 'Point Reyes' (Point Reyes Kinnikinnik )
Arctostaphylos uva-ursi 'San Bruno Mountain' (San Bruno Mountain Kinnikinnik )
Arctostaphylos viridissima 'White Cloud' (White Cloud McMinn's Manzanita )

Ardisia

Ardisia japonica (Japanese Ardisia )