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USA
Plants of the United States
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Families
Genera
Species
Abelmoschus
species
1
Abies
species
9
Abronia
species
10
Abrus
species
1
Abutilon
species
8
Acacia
species
18
Acaena
species
2
Acalypha
species
10
Acamptopappus
species
1
Acanthocereus
species
1
Acanthomintha
species
2
Acanthospermum
species
2
Acanthus
species
1
Acer
species
16
Achillea
species
7
Achlys
species
1
Achyrachaena
species
1
Achyranthes
species
3
Acinos
species
1
Acleisanthes
species
1
Aconitum
species
3
Acorus
species
1
Acourtia
species
3
Acrachne
species
1
Acrostichum
species
2
Actaea
species
5
Actinidia
species
3
Adenanthera
species
1
Adenocaulon
species
1
Adenophyllum
species
2
Adenostoma
species
1
Adiantum
species
6
Adonis
species
3
Adoxa
species
1
Aegilops
species
6
Aegopodium
species
1
Aeluropus
species
1
Aeonium
species
2
Aeschynomene
species
3
Aesculus
species
6
Aethusa
species
1
Agalinis
species
8
Agapanthus
species
1
Agastache
species
7
Agave
species
17
Ageratina
species
8
Ageratum
species
3
Aglaonema
species
1
Agnorhiza
species
1
Agoseris
species
6
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Genera
