California

• Alameda 06001
  1,856 taxa Open ↗
• Alpine 06003
  1,174 taxa Open ↗
• Amador 06005
  1,226 taxa Open ↗
• Butte 06007
  2,704 taxa Open ↗
• Calaveras 06009
  1,227 taxa Open ↗
• Colusa 06011
  1,330 taxa Open ↗
• Contra Costa 06013
  1,712 taxa Open ↗
• Del Norte 06015
  1,424 taxa Open ↗
• El Dorado 06017
  1,950 taxa Open ↗
• Fresno 06019
  2,373 taxa Open ↗

Showing 6,851–6,900 of 8,499 (native).

• 
  Polygonum pensylvanicum L. Native POPE2

  Pennsylvania smartweed · Polygonaceae 7 counties
• 
  Polygonum phytolaccifolium Meisn. ex Small Native POPH

  poke knotweed · Polygonaceae 16 counties
• 
  Polygonum polygaloides Wall. ex Meisn. Native POPO4

  milkwort knotweed · Polygonaceae 30 counties
• 
  Polygonum polygaloides Wall. ex Meisn. ssp. confertiflorum (Nutt. ex Piper) J.C. Hickman Native POPOC

  fruitleaf knotweed · Polygonaceae 11 counties
• 
  Polygonum polygaloides Wall. ex Meisn. ssp. esotericum (L.C. Wheeler) J.C. Hickman Native POPOE

  whitemargin knotweed · Polygonaceae 3 counties
• 
  Polygonum polygaloides Wall. ex Meisn. ssp. kelloggii (Greene) J.C. Hickman Native POPOK

  Kellogg's knotweed · Polygonaceae 30 counties
• 
  Polygonum punctatum Elliott Native POPU5

  dotted smartweed · Polygonaceae 42 counties
• 
  Polygonum punctatum Elliott var. confertiflorum (Meisn.) Fassett Native POPUC2

  dotted smartweed · Polygonaceae 1 county
• 
  Polygonum punctatum Elliott var. punctatum Native POPUP4

  dotted smartweed · Polygonaceae 1 county
• 
  Polygonum ramosissimum Michx. Native PORA3

  bushy knotweed · Polygonaceae 10 counties
• 
  Polygonum ramosissimum Michx. var. prolificum Small Native PORAP

  bushy knotweed · Polygonaceae 5 counties
• 
  Polygonum shastense W.H. Brewer Native POSH

  Shasta knotweed · Polygonaceae 17 counties
• 
  Polypodium californicum Kaulf. Native POCA12

  California polypody · Polypodiaceae 22 counties
• 
  Polypodium calirhiza S. Whitmore & A.R. Sm. Native POCA26

  nested polypody · Polypodiaceae 32 counties
• 
  Polypodium glycyrrhiza D.C. Eaton Native POGL8

  licorice fern · Polypodiaceae 12 counties
• 
  Polypodium hesperium Maxon Native POHE3

  western polypody · Polypodiaceae 4 counties
• 
  Polypodium scouleri Hook. & Grev. Native POSC4

  leathery polypody · Polypodiaceae 10 counties
• 
  Polypogon interruptus Kunth Native POIN7

  ditch rabbitsfoot grass · Poaceae 43 counties
• 
  Polystichum californicum (D.C. Eaton) Diels Native POCA25

  California swordfern · Dryopteridaceae 14 counties
• 
  Polystichum dudleyi Maxon Native PODU2

  Dudley's swordfern · Dryopteridaceae 8 counties
• 
  Polystichum imbricans (D.C. Eaton) D.H. Wagner Native POIM

  narrowleaf swordfern · Dryopteridaceae 31 counties
• 
  Polystichum imbricans (D.C. Eaton) D.H. Wagner ssp. curtum (Ewan) D.H. Wagner Native POIMC

  narrowleaf swordfern · Dryopteridaceae 14 counties
• 
  Polystichum imbricans (D.C. Eaton) D.H. Wagner ssp. imbricans Native POIMI

  narrowleaf swordfern · Dryopteridaceae 26 counties
• 
  Polystichum kruckebergii W.H. Wagner Native POKR

  Kruckeberg's hollyfern · Dryopteridaceae 8 counties
• 
  Polystichum lemmonii Underw. Native POLE5

  Lemmon's hollyfern · Dryopteridaceae 7 counties
• 
  Polystichum lonchitis (L.) Roth Native POLO4

  northern hollyfern · Dryopteridaceae 6 counties
• 
  Polystichum munitum (Kaulf.) C. Presl Native POMU

  western swordfern · Dryopteridaceae 26 counties
• 
  Polystichum scopulinum (D.C. Eaton) Maxon Native POSC5

  mountain hollyfern · Dryopteridaceae 18 counties
• 
  Populus angustifolia James Native POAN3

  narrowleaf cottonwood · Salicaceae 2 counties
• 
  Populus balsamifera L. Native POBA2

  balsam poplar · Salicaceae 44 counties
• 
  Populus balsamifera L. ssp. trichocarpa (Torr. & A. Gray ex Hook.) Brayshaw Native POBAT

  black cottonwood · Salicaceae 44 counties
• 
  Populus fremontii S. Watson Native POFR2

  Fremont cottonwood · Salicaceae 50 counties
• 
  Populus fremontii S. Watson ssp. fremontii Native POFRF3

  Fremont cottonwood · Salicaceae 50 counties
• 
  Populus tremuloides Michx. Native POTR5

  quaking aspen · Salicaceae 25 counties
• 
  Populus ×canadensis Moench (pro sp.) [deltoides × nigra] Native POCA19

  Carolina poplar · Salicaceae 1 county
• 
  Porophyllum gracile Benth. Native POGR5

  slender poreleaf · Asteraceae 6 counties
• 
  Porophyllum ruderale (Jacq.) Cass. Native PORU6

  yerba porosa · Asteraceae 1 county
• 
  Porophyllum ruderale (Jacq.) Cass. ssp. macrocephalum (DC.) R.R. Johnson Native PORUM2

  yerba porosa · Asteraceae 1 county
• 
  Porterella carnosula (Hook. & Arn.) Torr. Native POCA15

  fleshy porterella · Campanulaceae 16 counties
• 
  Portulaca halimoides L. Native POHA5

  silkcotton purslane · Portulacaceae 2 counties
• 
  Potamogeton alpinus Balbis Native POAL8

  alpine pondweed · Potamogetonaceae 8 counties
• 
  Potamogeton amplifolius Tuck. Native POAM5

  largeleaf pondweed · Potamogetonaceae 8 counties
• 
  Potamogeton diversifolius Raf. Native PODI

  waterthread pondweed · Potamogetonaceae 15 counties
• 
  Potamogeton epihydrus Raf. Native POEP2

  ribbonleaf pondweed · Potamogetonaceae 6 counties
• 
  Potamogeton foliosus Raf. Native POFO3

  leafy pondweed · Potamogetonaceae 39 counties
• 
  Potamogeton foliosus Raf. ssp. fibrillosus (Fernald) Haynes & C.B. Hellquist Native POFOF5

  leafy pondweed · Potamogetonaceae 1 county
• 
  Potamogeton foliosus Raf. ssp. foliosus Native POFOF4

  leafy pondweed · Potamogetonaceae 39 counties
• 
  Potamogeton gramineus L. Native POGR8

  variableleaf pondweed · Potamogetonaceae 17 counties
• 
  Potamogeton illinoensis Morong Native POIL

  Illinois pondweed · Potamogetonaceae 23 counties
• 
  Potamogeton natans L. Native PONA4

  floating pondweed · Potamogetonaceae 24 counties