- Abronia latifolia
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Abronia umbellata
- Picture 1
- Picture 2
- Acacia retinodes
- Acer macrophyllum
- Picture 1
- Picture 2
- Acer negundo var. californicum
- Picture 1 (fruits)
- Picture 2 (fruits)
- Picture 3 (fruits)
- Achillea millefolium
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Picture 6
- Achyrachaena mollis
- Picture 1 (fruiting heads)
- Picture 2
- Picture 3
- Actaea rubra
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Adenocaulon bicolor
- Picture 1
- Picture 2
- Adenostoma fasciculatum
- Picture 1
- Picture 2
- Aesculus californica
- Picture 1 (leaves)
- Picture 2
- Picture 3
- Picture 4
- Agoseris apargioides
- Allium lacunosum var. lacunosum
- Alnus rhombifolia
- Picture 1
- Picture 2
- Ambrosia chamissonis
- Picture 1
- Picture 2
- Picture 3
- Ambrosia psilostachya
- Amsinckia menziesii var. intermedia
- Anagallis arvensis
- Picture 1
- Picture 2
- Picture 3
- Picture 4
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- Anaphalis margaritacea
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Angelica tomentosa
- Anthemis cotula
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Aquilegia formosa
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Arabis blepharophylla
- Picture 1
- Picture 2
- Aralia californica
- Arbutus menziesii
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Armeria maritima
- Picture 1
- Picture 2
- Picture 3
- Armeria maritima var. californica
- Picture 1
- Picture 2
- Picture 3
- Artemisia californica
- Picture 1
- Picture 2
- Artemisia douglasiana
- Asarum caudatum
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Asclepias fascicularis
- Picture 1
- Picture 2
- Athyrium filix-femina var. cyclosorus
- Picture 1
- Picture 2
- Atriplex semibaccata
- Avena fatua
- Azolla filiculoides
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