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 4,101–4,150 of 5,518.

• 
  Polyctenium williamsiae Rollins Native POWI

  Washoe combleaf · Brassicaceae 1 county
• 
  Polygala californica Nutt. Native POCA5

  California milkwort · Polygalaceae 5 counties
• 
  Polygala vulgaris L. Introduced POVU2

  common milkwort · Polygalaceae 2 counties
• 
  Polygonum achoreum S.F. Blake Native POAC3

  leathery knotweed · Polygonaceae 1 county
• 
  Polygonum amphibium L. Native POAM8

  water knotweed · Polygonaceae 28 counties
• 
  Polygonum amphibium L. var. emersum Michx. Native POAME

  longroot smartweed · Polygonaceae 18 counties
• 
  Polygonum amphibium L. var. stipulaceum Coleman Native POAMS

  water smartweed · Polygonaceae 13 counties
• 
  Polygonum arenastrum Jord. ex Boreau Introduced POAR11

  oval-leaf knotweed · Polygonaceae 11 counties
• 
  Polygonum aviculare L. Introduced POAV

  prostrate knotweed · Polygonaceae 32 counties
• 
  Polygonum baldschuanicum Regel Introduced POBA3

  Bukhara fleeceflower · Polygonaceae 1 county
• 
  Polygonum bistortoides Pursh Native POBI6

  American bistort · Polygonaceae 32 counties
• 
  Polygonum californicum Meisn. Native POCA7

  California knotweed · Polygonaceae 4 counties
• 
  Polygonum capitatum Buch.-Ham. ex D. Don Introduced POCA21

  pinkhead smartweed · Polygonaceae 1 county
• 
  Polygonum cascadense W.H. Baker Native POCA9

  Cascade knotweed · Polygonaceae 6 counties
• 
  Polygonum convolvulus L. Introduced POCO10

  black bindweed · Polygonaceae 21 counties
• 
  Polygonum convolvulus L. var. convolvulus Introduced POCOC2

  black bindweed · Polygonaceae 21 counties
• 
  Polygonum cuspidatum Siebold & Zucc. Introduced POCU6

  Japanese knotweed · Polygonaceae 13 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 hydropiper L. Introduced POHY

  marshpepper knotweed · Polygonaceae 21 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 orientale L. Introduced POOR2

  kiss me over the garden gate · Polygonaceae 2 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 persicaria L. Introduced POPE3

  spotted ladysthumb · Polygonaceae 25 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 polystachyum Wall. ex Meisn. Introduced POPO5

  cultivated knotweed · Polygonaceae 7 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 sachalinense F. Schmidt ex Maxim. Introduced POSA4

  giant knotweed · Polygonaceae 12 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