- Abronia latifolia
- Picture 1
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- Picture 6
- Abronia umbellata
- Picture 1
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- Acacia farnesiana var. farnesiana
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Acalypha californica
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Acer macrophyllum
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Picture 6
- Achillea millefolium
- Achnatherum coronatum
- Achnatherum speciosum
- Achyrachaena mollis (fruiting head)
- Acourtia microcephala
- Picture 1
- Picture 2
- Picture 3
- Adenostoma fasciculatum
- Picture 1
- Picture 2
- Adenostoma sparsifolium
- Picture 1
- Picture 2
- Picture 3
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- Picture 5
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- Adiantum capillus-veneris
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Aesculus californica
- Picture 1
- Picture 2
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- Picture 4
- Agave shawii
- Ageratina adenophora
- Picture 1
- Picture 2
- Picture 3
- Agrostis stolonifera
- Picture 1
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- Allium crispum
- Picture 1
- Picture 2
- Picture 3
- Allium haematochiton
- Picture 1
- Picture 2
- Picture 3
- Allium lacunosum var. lacunosum
- Allium peninsulare
- Picture 1
- Picture 2
- Picture 3
- Alnus rhombifolia
- Picture 1
- Picture 2
- Amaranthus albus
- Ambrosia acanthicarpa
- Picture 1
- Picture 2
- Ambrosia chamissonis
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Ambrosia psilostachya
- Picture 1
- Picture 2
- Amsinckia eastwoodiae
- Picture 1
- Picture 2
- Picture 3
- Amsinckia menziesii var. intermedia
- Picture 1
- Picture 2
- Picture 3
- Anagallis arvensis
- Picture 1
- Picture 2
- Anaphalis margaritacea
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- Anemopsis californica
- Picture 1
- Picture 2
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- Picture 4
- Anthemis cotula
- Picture 1
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- Picture 3
- Picture 4
- Picture 5
- Antirrhinum coulterianum
- Picture 1
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- Antirrhinum kelloggii
- Picture 1
- Picture 2
- Antirrhinum multiflorum
- Picture 1
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- Picture 4
- Picture 5
- Antirrhinum nuttallianum
- Picture 1
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- Picture 4
- Picture 5
- Picture 6
- Aquilegia formosa
- Arabis blepharophylla
- Picture 1
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- Arbutus menziesii
- Picture 1
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- Picture 4
- Picture 5
- Arctostaphylos glauca
- Arctostaphylos rudis
- Armeria maritima var. californica
- Picture 1
- Picture 2
- Picture 3
- Artemisia californica
- Picture 1
- Picture 2
- Artemisia douglasiana
- Arundo donax
- Asclepias eriocarpa
- Picture 1
- Picture 2
- Picture 3
- Asclepias fascicularis
- Picture 1
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- Picture 3
- Picture 4
- Picture 5
- Picture 6
- Picture 7 (female catkins)
- Asphodelus fistulosus
- Picture 1
- Picture 2
- Picture 3
- Aster lanceolatus ssp. hesperius
- Picture 1
- Picture 2
- Picture 3
- Astragalus brauntonii
- Picture 1 (Rare)
- Picture 2 (Rare)
- Picture 3 (Rare)
- Picture 4 (Rare)
- Astragalus trichopodus
- Picture 1
- Picture 2
- Astragalus trichopodus var. lonchus
- Athyrium filix-femina var. cyclosorus
- Picture 1
- Picture 2
- Atriplex lentiformis
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Atriplex rosea
- Picture 1
- Picture 2
- Picture 3
- Atriplex semibaccata
- Atriplex triangularis
- Picture 1
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- Picture 3
- Picture 4
- Atriplex watsonii
- Avena fatua
- Azolla filiculoides
- Picture 1
- Picture 2
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