Contra Costa County

Showing 1–50 of 1,712.

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  Abutilon theophrasti Medik. Introduced ABTH

  velvetleaf · Malvaceae
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  Acacia dealbata Link Introduced ACDE3

  silver wattle · Fabaceae
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  Acacia melanoxylon R. Br. Introduced ACME

  blackwood · Fabaceae
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  Acacia paradoxa DC. Introduced ACPA8

  paradox acacia · Fabaceae
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  Acaena pinnatifida Ruiz & Pav. Native ACPI3

  Argentinian biddy-biddy · Rosaceae
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  Acaena pinnatifida Ruiz & Pav. var. californica (Bitter) Jeps. Native ACPIC2

  California biddy-biddy · Rosaceae
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  Acer macrophyllum Pursh Native ACMA3

  bigleaf maple · Aceraceae
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  Acer negundo L. Native ACNE2

  boxelder · Aceraceae
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  Acer negundo L. var. californicum (Torr. & A. Gray) Sarg. Native ACNEC2

  California boxelder · Aceraceae
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  Acer negundo L. var. interius (Britton) Sarg. Native ACNEI2

  boxelder · Aceraceae
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  Achillea millefolium L. Both ACMI2

  common yarrow · Asteraceae
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  Achillea millefolium L. var. californica (Pollard) Jeps. Native ACMIC

  California yarrow · Asteraceae
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  Achillea millefolium L. var. puberula (Rydb.) Nobs Native ACMIP2

  common yarrow · Asteraceae
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  Achyrachaena mollis Schauer Native ACMO2

  blow wives · Asteraceae
• 
  Acroptilon repens (L.) DC. Introduced ACRE3

  hardheads · Asteraceae
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  Actaea rubra (Aiton) Willd. Native ACRU2

  red baneberry · Ranunculaceae
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  Actaea rubra (Aiton) Willd. ssp. arguta (Nutt.) Hultén Native ACRUA8

  red baneberry · Ranunculaceae
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  Adenostoma fasciculatum Hook. & Arn. Native ADFA

  chamise · Rosaceae
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  Adenostoma fasciculatum Hook. & Arn. var. fasciculatum Native ADFAF

  chamise · Rosaceae
• 
  Adiantum jordanii C.H. Mull. Native ADJO

  California maidenhair · Pteridaceae
• 
  Aegilops triuncialis L. Introduced AETR

  barbed goatgrass · Poaceae
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  Aesculus californica (Spach) Nutt. Native AECA

  California buckeye · Hippocastanaceae
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  Agoseris apargioides (Less.) Greene Native AGAP2

  woolly goat chicory · Asteraceae
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  Agoseris apargioides (Less.) Greene var. apargioides Native AGAPA

  woolly goat chicory · Asteraceae
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  Agoseris grandiflora (Nutt.) Greene Native AGGR

  bigflower agoseris · Asteraceae
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  Agoseris heterophylla (Nutt.) Greene Native AGHE2

  annual agoseris · Asteraceae
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  Agoseris retrorsa (Benth.) Greene Native AGRE

  spearleaf agoseris · Asteraceae
• 
  Agrostis avenacea J.F. Gmel. Introduced AGAV

  Pacific bentgrass · Poaceae
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  Agrostis exarata Trin. Native AGEX

  spike bentgrass · Poaceae
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  Agrostis hallii Vasey Native AGHA2

  Hall's bentgrass · Poaceae
• 
  Agrostis pallens Trin. Native AGPA8

  seashore bentgrass · Poaceae
• 
  Agrostis stolonifera L. Introduced AGST2

  creeping bentgrass · Poaceae
• 
  Aira caryophyllea L. Introduced AICA

  silver hairgrass · Poaceae
• 
  Aira caryophyllea L. var. cupaniana (Guss.) Fiori Introduced AICAC3

  silver hairgrass · Poaceae
• 
  Alhagi maurorum Medik. Introduced ALMA12

  camelthorn · Fabaceae
• 
  Alisma subcordatum Raf. Native ALSU

  American water plantain · Alismataceae
• 
  Allenrolfea occidentalis (S. Watson) Kuntze Native ALOC2

  iodinebush · Chenopodiaceae
• 
  Allium acuminatum Hook. Native ALAC4

  tapertip onion · Liliaceae
• 
  Allium amplectens Hook. Native ALAM2

  narrowleaf onion · Liliaceae
• 
  Allium crispum Greene Native ALCR5

  crinkled onion · Liliaceae
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  Allium falcifolium Hook. & Arn. Native ALFA3

  scytheleaf onion · Liliaceae
• 
  Allium neapolitanum Cirillo Introduced ALNE3

  white garlic · Liliaceae
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  Allium peninsulare Lemmon ex Greene Native ALPE

  Mexicali onion · Liliaceae
• 
  Allium peninsulare Lemmon ex Greene var. peninsulare Native ALPEP2

  penisula onion · Liliaceae
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  Allium serra McNeal & Ownbey Native ALSE3

  jeweled onion · Liliaceae
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  Allium unifolium Kellogg Native ALUN

  oneleaf onion · Liliaceae
• 
  Allophyllum divaricatum (Nutt.) A.D. Grant & V.E. Grant Native ALDI4

  purple false gilyflower · Polemoniaceae
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  Allophyllum gilioides (Benth.) A.D. Grant & V.E. Grant Native ALGI

  dense false gilyflower · Polemoniaceae
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  Allophyllum gilioides (Benth.) A.D. Grant & V.E. Grant ssp. gilioides Native ALGIG

  dense false gilyflower · Polemoniaceae
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  Allophyllum gilioides (Benth.) A.D. Grant & V.E. Grant ssp. violaceum (A. Heller) Day Native ALGIV

  dense false gilyflower · Polemoniaceae