Abelia

Abelia × 'Edward Goucher' (Edward Goucher Abelia)
Abelia × grandiflora (Glossy Abelia)
Abelia × grandiflora 'Francis Mason' (Francis Mason Glossy Abelia)

Abeliophyllum

Abeliophyllum distichum (White Forsythia )

Acer

Acer capillipes (Red Stripebark Maple )
Acer carpinifolium (Hornbeam Maple)
Acer coriaceifolium (Leatherleaf Maple)
Acer davidii (David Maple )
Acer henryi (Henry's Maple)
Acer sempervirens (Cretan Maple)

Adansonia

Adansonia digitata (Baobab)

Adenium

Adenium obesum (Desert Rose )

Adenocarpus

Adenocarpus decorticans (Silver Broom )

Aesculus

Aesculus californica (California Buckeye )
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)

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 cordata (Italian Alder)
Alnus glutinosa (Common 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 )

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 )

Andromeda

Andromeda polifolia (Bog Rosemary)

Aralia

Aralia elata (Angelica 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 '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 )

Argyrocytisus

Argyrocytisus battandieri (Pineapple Broom )

Aronia

Aronia arbutifolia (Red Chokeberry)
Aronia arbutifolia 'Brilliantissima' (Brilliant Red Chokeberry)
Aronia melanocarpa (Black Chokeberry)

Asimina

Asimina triloba (Common Pawpaw )

Aucuba

Aucuba japonica (Japanese Aucuba )

Azadirachta

Azadirachta indica (Neem )

Azara

Azara microphylla (Boxleaf Azara)

Baccharis

Baccharis pilularis (Coyote Bush )

Berberis

Berberis buxifolia 'Nana' (Dwarf Magellan Barberry )
Berberis × gladwynensis 'William Penn' (William Penn Barberry)
Berberis jamesiana (James Barberry)
Berberis julianae (Wintergreen Barberry)