Oregon

• Baker 41001
  1,572 taxa Open ↗
• Benton 41003
  1,855 taxa Open ↗
• Clackamas 41005
  1,485 taxa Open ↗
• Clatsop 41007
  979 taxa Open ↗
• Columbia 41009
  1,183 taxa Open ↗
• Coos 41011
  1,238 taxa Open ↗
• Crook 41013
  1,354 taxa Open ↗
• Curry 41015
  1,738 taxa Open ↗
• Deschutes 41017
  1,482 taxa Open ↗
• Douglas 41019
  2,250 taxa Open ↗

Showing 3,451–3,500 of 4,583 (native).

• 
  Polygonum californicum Meisn. Native POCA7

  California knotweed · Polygonaceae 4 counties
• 
  Polygonum cascadense W.H. Baker Native POCA9

  Cascade knotweed · Polygonaceae 6 counties
• 
  Polygonum davisiae W.H. Brewer ex A. Gray Native PODA

  Davis' knotweed · Polygonaceae 11 counties
• 
  Polygonum douglasii Greene Native PODO4

  Douglas' knotweed · Polygonaceae 35 counties
• 
  Polygonum douglasii Greene ssp. austiniae (Greene) A.E. Murray Native PODOA2

  Austin knotweed · Polygonaceae 8 counties
• 
  Polygonum douglasii Greene ssp. douglasii Native PODOD4

  Douglas' knotweed · Polygonaceae 15 counties
• 
  Polygonum douglasii Greene ssp. johnstonii (Munz) J.C. Hickman Native PODOJ2

  Johnston's knotweed · Polygonaceae 10 counties
• 
  Polygonum douglasii Greene ssp. majus (Meisn.) J.C. Hickman Native PODOM2

  large knotweed · Polygonaceae 22 counties
• 
  Polygonum douglasii Greene ssp. nuttallii (Small) J.C. Hickman Native PODON

  Nuttall's knotweed · Polygonaceae 7 counties
• 
  Polygonum douglasii Greene ssp. spergulariiforme (Meisn. ex Small) J.C. Hickman Native PODOS2

  scatter knotweed · Polygonaceae 18 counties
• 
  Polygonum erectum L. Native POER2

  erect knotweed · Polygonaceae 3 counties
• ⚘
  Polygonum heterosepalum M. Peck & Ownbey Native POHE2

  oddsepal knotweed · Polygonaceae 5 counties
• 
  Polygonum hydropiperoides Michx. Native POHY2

  swamp smartweed · Polygonaceae 14 counties
• 
  Polygonum lapathifolium L. Native POLA4

  curlytop knotweed · Polygonaceae 24 counties
• 
  Polygonum minimum S. Watson Native POMI2

  broadleaf knotweed · Polygonaceae 19 counties
• 
  Polygonum paronychia Cham. & Schltdl. Native POPA7

  beach knotweed · Polygonaceae 9 counties
• 
  Polygonum parryi Greene Native POPA8

  Parry's knotweed · Polygonaceae 4 counties
• 
  Polygonum pensylvanicum L. Native POPE2

  Pennsylvania smartweed · Polygonaceae 4 counties
• 
  Polygonum phytolaccifolium Meisn. ex Small Native POPH

  poke knotweed · Polygonaceae 10 counties
• 
  Polygonum polygaloides Wall. ex Meisn. Native POPO4

  milkwort knotweed · Polygonaceae 27 counties
• 
  Polygonum polygaloides Wall. ex Meisn. ssp. confertiflorum (Nutt. ex Piper) J.C. Hickman Native POPOC

  fruitleaf knotweed · Polygonaceae 18 counties
• 
  Polygonum polygaloides Wall. ex Meisn. ssp. kelloggii (Greene) J.C. Hickman Native POPOK

  Kellogg's knotweed · Polygonaceae 19 counties
• 
  Polygonum punctatum Elliott Native POPU5

  dotted smartweed · Polygonaceae 9 counties
• 
  Polygonum punctatum Elliott var. confertiflorum (Meisn.) Fassett Native POPUC2

  dotted smartweed · Polygonaceae 9 counties
• 
  Polygonum ramosissimum Michx. Native PORA3

  bushy knotweed · Polygonaceae 5 counties
• 
  Polygonum ramosissimum Michx. var. prolificum Small Native PORAP

  bushy knotweed · Polygonaceae 5 counties
• 
  Polygonum sagittatum L. Native POSA5

  arrowleaf tearthumb · Polygonaceae 1 county
• 
  Polygonum shastense W.H. Brewer Native POSH

  Shasta knotweed · Polygonaceae 2 counties
• 
  Polygonum viviparum L. Native POVI3

  alpine bistort · Polygonaceae 2 counties
• 
  Polypodium amorphum Suksd. Native POAM7

  irregular polypody · Polypodiaceae 4 counties
• 
  Polypodium calirhiza S. Whitmore & A.R. Sm. Native POCA26

  nested polypody · Polypodiaceae 3 counties
• 
  Polypodium glycyrrhiza D.C. Eaton Native POGL8

  licorice fern · Polypodiaceae 19 counties
• 
  Polypodium hesperium Maxon Native POHE3

  western polypody · Polypodiaceae 20 counties
• 
  Polypodium scouleri Hook. & Grev. Native POSC4

  leathery polypody · Polypodiaceae 8 counties
• 
  Polypogon interruptus Kunth Native POIN7

  ditch rabbitsfoot grass · Poaceae 7 counties
• 
  Polystichum andersonii Hopkins Native POAN2

  Anderson's hollyfern · Dryopteridaceae 7 counties
• 
  Polystichum californicum (D.C. Eaton) Diels Native POCA25

  California swordfern · Dryopteridaceae 5 counties
• 
  Polystichum imbricans (D.C. Eaton) D.H. Wagner Native POIM

  narrowleaf swordfern · Dryopteridaceae 21 counties
• 
  Polystichum imbricans (D.C. Eaton) D.H. Wagner ssp. imbricans Native POIMI

  narrowleaf swordfern · Dryopteridaceae 21 counties
• 
  Polystichum kruckebergii W.H. Wagner Native POKR

  Kruckeberg's hollyfern · Dryopteridaceae 10 counties
• 
  Polystichum lemmonii Underw. Native POLE5

  Lemmon's hollyfern · Dryopteridaceae 3 counties
• 
  Polystichum lonchitis (L.) Roth Native POLO4

  northern hollyfern · Dryopteridaceae 15 counties
• 
  Polystichum munitum (Kaulf.) C. Presl Native POMU

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

  mountain hollyfern · Dryopteridaceae 14 counties
• 
  Pontederia cordata L. Native POCO14

  pickerelweed · Pontederiaceae 3 counties
• 
  Populus angustifolia James Native POAN3

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

  balsam poplar · Salicaceae 33 counties
• 
  Populus balsamifera L. ssp. trichocarpa (Torr. & A. Gray ex Hook.) Brayshaw Native POBAT

  black cottonwood · Salicaceae 33 counties
• 
  Populus tremuloides Michx. Native POTR5

  quaking aspen · Salicaceae 29 counties
• 
  Porterella carnosula (Hook. & Arn.) Torr. Native POCA15

  fleshy porterella · Campanulaceae 6 counties