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| Plants listed as "A" rated weeds by the California Department of Food and Agriculture (CDFA).
The “A”-rating is for pests of the agricultural industry or environment which score high in the Pest Rating Evaluation Process. These species are not known to occur or are under official control in the state of California. Some "A" rated weeds are not currently listed in Calflora. These plants have not been found growing in California, or are not listed due to taxonomical differences between CDFA's list and the CalFlora database. (last updated 2020-10-28) |
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| 101 PLANTS |
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elodea najas Small Tree-Mallow
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Baccharis halimifolia Small Tree-Mallow
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Acaena anserinifolia Biddy biddy
• invasive non-native
Shrub (stem succulent) 
© 2023 Patrick Hoffman 
© 2024 Patrick Hoffman 
© 2018 Hayley Ross |
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Acaena novae-zelandiae Biddy biddy
• invasive non-native
Shrub (stem succulent)
© 2023 Patrick Hoffman
© 2024 Patrick Hoffman
© 2018 Hayley Ross |
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Aeschynomene rudis Red aeschynomene, Zigzag jointvetch
• invasive non-native
Annual, Perennial herb  © 2001 CDFA  © 2001 CDFA  © 2001 CDFA |
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Alternanthera philoxeroides Alligator weed, Alligatorweed
• invasive non-native
Perennial herb 
© 2019 Robin Carter 
© 2023 Ron Vanderhoff 
© 2024 Mike Russler |
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Alternanthera sessilis Sessile joyweed
non-native
Perennial herb |
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Arctotheca calendula Cape weed
• invasive non-native
Annual, Perennial herb 
© 2021 Patrick Hoffman 
© 2023 Nancy Poss 
© 2016 Andrea Pickart |
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Brachypodium sylvaticum Slender false brome
• invasive non-native
Perennial grass 
© 2018 Ecological Concerns Inc 
© 2021 SMCP NRM Intern 
© 2020 John Rawlings |
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Carduus acanthoides Plumeless thistle, Spiny plumeless thistle
• invasive non-native
Perennial herb 
© 2016 Catherine Talbot 
© 2016 Catherine Talbot 
© 2015 Catherine Talbot |
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Carduus crispus Curly plumeless thistle
non-native
Annual herb |
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Carduus nutans Musk thistle, Nodding plumeless thistle
• invasive non-native
Perennial herb 
© 2022 Bob Sweatt 
© 2022 Bob Sweatt 
© 2022 Bob Sweatt |
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Carrichtera annua Wards weed
• invasive non-native
Annual herb 
© 2023 Ron Vanderhoff 
© 2023 Ron Vanderhoff 
© 2023 Ron Vanderhoff |
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Carthamus leucocaulos White stemmed distaff thistle, Whitestem distaff thistle
• invasive non-native
Annual herb  © 2001 CDFA  © 2001 CDFA |
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Centaurea diffusa Diffuse knapweed, White knapweed
• invasive non-native
Perennial herb 
© 2020 David Greenberger 
© 2022 Bob Sweatt 
© 2019 Catherine Talbot |
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Centaurea iberica Iberian knapweed
• invasive non-native
Perennial herb 
© 2016 Don Thomas  © 2001 CDFA  © 2001 CDFA |
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Centaurea jacea Brownray knapweed, Brown knapweed
non-native
Perennial herb 
© 2020 Domenic Bongio 
© 2022 Patrick Hoffman 
© 2019 Jonathan Lee |
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Centaurea nigra Black knapweed
non-native
Perennial herb  © 2005 Louis-M. Landry  © 2005 Louis-M. Landry  © 2009 Phil Pullen |
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Centaurea nigrescens Tyrol knapweed
non-native
Perennial herb 
© 2007 Keir Morse 
© 2007 Keir Morse 
© 2007 Keir Morse |
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Centaurea pratensis Tyrol knapweed
non-native
Perennial herb
© 2007 Keir Morse
© 2007 Keir Morse
© 2007 Keir Morse |
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Centaurea stoebe Spotted knapweed
non-native
Perennial herb 
© 2020 Bob Sweatt 
© 2022 BOB CASE 
© 2019 Amanda Mills |
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Centaurea maculosa Spotted knapweed
• invasive non-native
Perennial herb 
© 2021 Patrick Hoffman 
© 2024 Joan Miller 
© 2024 Joan Miller |
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Centaurea squarrosa Squarrose knapweed
• invasive non-native
Perennial herb 
© 2013 Gerald Carr 
© 2013 Gerald Carr 
© 2013 Gerald Carr |
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Chondrilla juncea Hogbite, Skeleton weed
• invasive non-native
Perennial herb 
© 2021 George Williams 
© 2024 Mike Russler 
© 2021 Bob Sweatt |
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non-native
© 2020 Ron Vanderhoff 
© 2018 Josie Bennett 
© 2020 Ron Vanderhoff |
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Clematis vitalba Old man's beard, Traveller's joy
• invasive non-native
Vine 
© 2015 ken moore 
© 2019 Cynthia Powell 
© 2015 Ellen Uhler |
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Crupina vulgaris Bearded creeper, Common crupina
• invasive non-native
Annual herb 
© 2023 Norm Macdonald 
© 2012 Ramona Robison 
© 2015 Daniel Lay |
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Cucumis melo var. dudaim Dudaim melon
• invasive non-native
Annual, Perennial herb  © 2001 CDFA  © 2001 CDFA |
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Cuscuta epithymum ssp. approximata Alfalfa dodder
non-native
Annual herb, Vine (parasitic) |
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Cuscuta approximata Alfalfa dodder
non-native
Annual herb, Vine (parasitic) |
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Cuscuta cupulata Alfalfa dodder
non-native
Annual herb, Vine (parasitic) |
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Cuscuta japonica Japanese dodder
• invasive non-native
Annual herb, Vine (parasitic) 
© 2014 Michael Perlmutter 
© 2013 David Chang 
© 2014 Michael Perlmutter |
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Cuscuta japonica var. formosana Japanese dodder
non-native
Annual herb, Vine (parasitic) |
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Dittrichia viscosa False yellowhead
• invasive non-native
Perennial herb 
© 2020 Matthew Perryman 
© 2022 Brad Cook 
© 2021 Phil Calhoun |
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Echium plantagineum Salvation echium, Salvation jane, Viper's bugloss
• invasive non-native
Annual, Perennial herb 
© 2020 John Rawlings 
© 2019 Ken Hickman 
© 2011 Daniel Gluesenkamp |
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Enchylaena tomentosa Ruby saltbush
non-native
Perennial herb 
© 2015 Dean Kelch 
© 2014 Amy Huie 
© 2015 Dean Kelch |
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Euphorbia hypericifolia graceful sandmat
non-native
Annual herb 
© 2022 Ron Vanderhoff 
© 2017 Ron Vanderhoff 
© 2022 Ron Vanderhoff |
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Euphorbia myrsinites Myrtle spurge
non-native
Biennial, Perennial herb 
© 2020 Julie A. Kierstead 
© 2018 Tom Getts 
© 2018 Tom Getts |
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Euphorbia esula Leafy spurge
• invasive non-native
Perennial herb 
© 2023 Nikki Valentine 
© 2019 Lenihan Mazur 
© 2019 Lenihan Mazur |
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Euphorbia virgata Leafy spurge
• invasive non-native
Perennial herb
© 2023 Nikki Valentine
© 2019 Lenihan Mazur
© 2019 Lenihan Mazur |
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Fallopia japonica Japanese knotweed
• invasive non-native
Perennial herb 
© 2021 Margot Cunningham 
© 2024 Jacob Martin 
© 2019 John Malpas |
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Reynoutria japonica Japanese knotweed
• invasive non-native
Perennial herb
© 2021 Margot Cunningham
© 2024 Jacob Martin
© 2019 John Malpas |
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Polygonum cuspidatum Japanese knotweed
• invasive non-native
Perennial herb
© 2021 Margot Cunningham
© 2024 Jacob Martin
© 2019 John Malpas |
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Fallopia sachalinensis Giant knotweed
• invasive non-native
Perennial herb 
© 2024 Patrick Hoffman 
© 2024 Patrick Hoffman 
© 2023 John Malpas |
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Reynoutria sachalinensis Giant knotweed
• invasive non-native
Perennial herb
© 2024 Patrick Hoffman
© 2024 Patrick Hoffman
© 2023 John Malpas |
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Fallopia Xbohemica Bohemian knotweed
• invasive non-native
Perennial herb 
© 2018 Scot Loring 
© 2018 Scot Loring 
© 2018 Scot Loring |
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Galega officinalis Professor-weed
• invasive non-native
Perennial herb 
© 2017 Gerald Carr 
© 2017 Gerald Carr 
© 2017 Gerald Carr |
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Geranium lucidum Shiny geranium, Shining geranium
• invasive non-native
Annual, Biennial herb 
© 2025 Mary Ann Machi 
© 2021 Susan Fawcett 
© 2025 Mary Ann Machi |
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Halimodendron halodendron Common salttree, Russian salt tree
• invasive non-native
Shrub  © 2001 CDFA  © 2001 CDFA  © 2001 CDFA |
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Halogeton glomeratus Halogeton, Saltlover
• invasive non-native
Annual herb 
© 2019 Joe Woods 
© 2019 Joe Woods 
© 2019 Caleb Cole |
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Helianthus ciliaris Texas blueweed
• invasive non-native
Perennial herb  © 2001 CDFA  © 2001 CDFA  © 2001 CDFA |
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Heracleum mantegazzianum Giant hogweed
non-native
Perennial herb  © 2008 Bill Moses  © 2008 Bill Moses  © 2008 Bill Moses |
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Hydrilla verticillata Hydrilla, Waterthyme
• invasive non-native
Perennial herb 
© 2024 Ron Vanderhoff 
© 2024 Ron Vanderhoff 
© 2024 Ron Vanderhoff |
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Hygrophila polysperma Indian swampweed
non-native
Tree |
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Lagarosiphon major Oxygen-weed
non-native
Perennial herb |
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Limnobium laevigatum American spongeplant
• invasive non-native
Perennial herb 
© 2024 R.A. Chasey 
© 2022 Donald Burk 
© 2021 Jutta Burger |
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Limnobium spongia American spongeplant
• invasive non-native
Perennial herb
© 2024 R.A. Chasey
© 2022 Donald Burk
© 2021 Jutta Burger |
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Limnophila indica Indian marshweed
non-native
Perennial herb |
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Limnophila sessiliflora Asian marshweed
non-native
Perennial herb |
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Linaria dalmatica Dalmatian toadflax
non-native
Perennial herb 
© 2022 Jonathan Widdicombe 
© 2022 Patrick Hoffman 
© 2021 Diana Wing |
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Ludwigia decurrens Wingleaf primrose-willow
non-native
Perennial herb 
© 2022 Timothy Blank 
© 2022 Timothy Blank 
© 2024 Sonia Zarate |
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Ludwigia peruviana Peruvian primrose-willow
non-native
Perennial herb |
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Monochoria vaginalis Heart shape false pickerelweed, Heartshape false pickerelweed
• invasive non-native
Perennial herb 
© 2022 Timothy Blank 
© 2022 Timothy Blank 
© 2022 Timothy Blank |
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Nymphoides peltata Water fringe, Yellow floatingheart
non-native
Perennial herb  © 2011 Louis-M. Landry  © 2001 CDFA |
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Ononis alopecuroides Foxtail restharrow
• invasive non-native
Annual herb  © 2018 Joe DiTomaso  © 2018 Joe DiTomaso  © 2018 Joe DiTomaso |
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Onopordum Illyricum Illyrian cottonthistle, Illyrian thistle
• invasive non-native
Annual, Biennial herb 
© 2021 Nancy Barrera 
© 2021 Nancy Barrera 
© 2021 Nancy Barrera |
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Orobanche aegyptiaca Egyptian broomrape
• invasive non-native
Perennial herb (parasitic) |
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Orobanche hederae Ivy broomrape
non-native
Perennial herb (parasitic) 
© 2019 Chasey 
© 2019 Chasey  © 2003 Dean Wm. Taylor |
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Parthenium hysterophorus Santa maria feverfew
• invasive non-native
Perennial herb 
© 2019 Nathan Taxel 
© 2019 Nathan Taxel 
© 2018 Ron Vanderhoff |
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Peganum harmala Harmal peganum
• invasive non-native
Perennial herb  © 2011 Debra L. Cook 
© 2021 Caleb Cole  © 2001 CDFA |
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Orobanche ramosa Yellow broom rape
non-native
Perennial herb (parasitic)  © 2001 CDFA  © 2006 Luigi Rignanese  © 2007 Luigi Rignanese |
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Physalis viscosa Grape ground cherry
• invasive non-native
Perennial herb  © 2007 Zoya Akulova  © 2007 Zoya Akulova |
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Phytolacca heterotepala Mexican pokeweed, Pokeberry
non-native
Perennial herb 
© 2017 Ron Vanderhoff 
© 2017 Ron Vanderhoff 
© 2017 Ron Vanderhoff |
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Potentilla recta Sulphur cinquefoil
non-native
Perennial herb 
© 2009 Robert Carr 
© 2009 Robert Carr 
© 2018 Scot Loring |
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Salsola collina Slender russian thistle
non-native
Annual herb |
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Salvia virgata Wand sage
• invasive non-native
Perennial herb |
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Salvinia auriculata Water spangles
non-native
Annual, Perennial herb 
© 2020 Ron Vanderhoff 
© 2020 Ron Vanderhoff 
© 2020 Ron Vanderhoff |
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Scolymus hispanicus Common goldenthistle, Golden thistle
• invasive non-native
Perennial herb  © 2004 Dr. Amadej Trnkoczy  © 2001 CDFA |
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Aeschynomene emerus Bigpod sesbania
native
Annual herb 
© 2018 Meg Devine 
© 2018 Meg Devine  © 2009 Barry Rice |
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Solanum cardiophyllum Heartleaf horsenettle
non-native
Annual, Perennial herb  © 2001 CDFA  © 2001 CDFA |
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Solanum dimidiatum Torrey's nightshade, Western horsenettle
• invasive non-native
Perennial herb  © 2006 Howard Orman Clark, Jr.  © 2001 CDFA |
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Sonchus arvensis Field sowthistle, Perennial sow thistle
• invasive non-native
Perennial herb 
© 2023 Cynthia Powell 
© 2023 Cynthia Powell 
© 2015 Friends of Five Creeks volunteers |
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Sphaerophysa salsula Alkali swainsonpea, Austrian peaweed
• invasive non-native
Perennial herb  © 2009 Barry Breckling  © 2009 Barry Breckling |
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Stipa brachychaeta Puna needle grass
• invasive non-native
Perennial grass 
© 2020 Adrian Lustre 
© 2020 Adrian Lustre 
© 2020 Adrian Lustre |
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Striga asiatica Asiatic witchweed
non-native
Perennial herb |
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Prosopis strombulifera Argentine screwbean
non-native
Shrub |
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Tagetes minuta Little marigold, Muster john henry
• invasive non-native
Annual herb 
© 2018 Mel Graham  © 2001 CDFA |
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Viscum album European mistletoe
• invasive non-native
Shrub (parasitic) 
© 2019 Susan McDougall 
© 2019 Susan McDougall  © 2007 François Meignant |
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Volutaria canariensis Canary island knapweed
non-native
Annual herb |
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Volutaria tubuliflora Egyptian knapweed
• invasive non-native
Annual herb 
© 2017 Ron Vanderhoff 
© 2020 Ron Vanderhoff 
© 2020 Lynn Sweet |
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Zostera japonica Dwarf eelgrass
• invasive non-native
Perennial herb 
© 2014 Gerald Carr 
© 2014 Gerald Carr 
© 2014 Gerald Carr |
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Zygophyllum fabago Syrian beancaper
• invasive non-native
Perennial herb 
© 2013 Daniel Gluesenkamp  © 2001 CDFA  © 2001 CDFA |
