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 1,001–1,050 of 1,412 (introduced).

• ⚘
  Platanus ×hispanica Mill. ex Münchh. [occidentalis × orientalis] Introduced PLHI

  London planetree · Platanaceae 1 county
• 
  Plecostachys serpyllifolia (P.J. Bergius) Hilliard & B.L. Burtt Introduced PLSE7

  petite licorice · Asteraceae 8 counties
• 
  Plumbago auriculata Lam. Introduced PLAU6

  Cape leadwort · Plumbaginaceae 1 county
• 
  Poa annua L. Introduced POAN

  annual bluegrass · Poaceae 49 counties
• 
  Poa bulbosa L. Introduced POBU

  bulbous bluegrass · Poaceae 37 counties
• 
  Poa compressa L. Introduced POCO

  Canada bluegrass · Poaceae 26 counties
• 
  Poa infirma Kunth Introduced POIN30

  weak bluegrass · Poaceae 1 county
• 
  Poa nemoralis L. ssp. nemoralis Introduced PONEN2

  wood bluegrass · Poaceae 3 counties
• 
  Poa pratensis L. ssp. pratensis Introduced POPRP2

  Kentucky bluegrass · Poaceae 49 counties
• 
  Poa trivialis L. Introduced POTR2

  rough bluegrass · Poaceae 12 counties
• 
  Pohlia flexuosa Harv. Introduced POFL2

  Bryaceae 1 county
• 
  Polycarpon tetraphyllum (L.) L. Introduced POTE

  fourleaf manyseed · Caryophyllaceae 24 counties
• 
  Polycarpon tetraphyllum (L.) L. ssp. tetraphyllum Introduced POTET2

  fourleaf manyseed · Caryophyllaceae 24 counties
• 
  Polygala myrtifolia L. Introduced POMY5

  myrtle-leaf milkwort · Polygalaceae 1 county
• 
  Polygonum arenastrum Jord. ex Boreau Introduced POAR11

  oval-leaf knotweed · Polygonaceae 54 counties
• 
  Polygonum argyrocoleon Steud. ex Kunze Introduced POAR5

  silversheath knotweed · Polygonaceae 20 counties
• 
  Polygonum aviculare L. Introduced POAV

  prostrate knotweed · Polygonaceae 1 county
• 
  Polygonum baldschuanicum Regel Introduced POBA3

  Bukhara fleeceflower · Polygonaceae 1 county
• 
  Polygonum capitatum Buch.-Ham. ex D. Don Introduced POCA21

  pinkhead smartweed · Polygonaceae 4 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 14 counties
• 
  Polygonum hydropiper L. Introduced POHY

  marshpepper knotweed · Polygonaceae 18 counties
• 
  Polygonum multiflorum Thunb. Introduced POMU13

  tuber fleeceflower · Polygonaceae 1 county
• 
  Polygonum orientale L. Introduced POOR2

  kiss me over the garden gate · Polygonaceae 2 counties
• 
  Polygonum patulum M. Bieb. Introduced POPA9

  Bellard's smartweed · Polygonaceae 7 counties
• 
  Polygonum persicaria L. Introduced POPE3

  spotted ladysthumb · Polygonaceae 44 counties
• 
  Polygonum polystachyum Wall. ex Meisn. Introduced POPO5

  cultivated knotweed · Polygonaceae 5 counties
• 
  Polygonum sachalinense F. Schmidt ex Maxim. Introduced POSA4

  giant knotweed · Polygonaceae 12 counties
• 
  Polypogon australis Brongn. Introduced POAU3

  Chilean rabbitsfoot grass · Poaceae 21 counties
• ⚘
  Polypogon imberbis (Phil.) Johow Introduced POIM3

  beardless rabbitsfoot grass · Poaceae 2 counties
• 
  Polypogon maritimus Willd. Introduced POMA10

  Mediterranean rabbitsfoot grass · Poaceae 26 counties
• 
  Polypogon monspeliensis (L.) Desf. Introduced POMO5

  annual rabbitsfoot grass · Poaceae 53 counties
• 
  Polypogon viridis (Gouan) Breistr. Introduced POVI9

  beardless rabbitsfoot grass · Poaceae 33 counties
• 
  Populus alba L. Introduced POAL7

  white poplar · Salicaceae 11 counties
• 
  Populus nigra L. Introduced PONI

  Lombardy poplar · Salicaceae 5 counties
• 
  Potamogeton crispus L. Introduced POCR3

  curly pondweed · Potamogetonaceae 22 counties
• 
  Potentilla anglica Laicharding Introduced POAN7

  English cinquefoil · Rosaceae 5 counties
• 
  Potentilla recta L. Introduced PORE5

  sulphur cinquefoil · Rosaceae 5 counties
• 
  Potentilla reptans L. Introduced PORE6

  creeping cinquefoil · Rosaceae 1 county
• 
  Prosopis strombulifera (Lam.) Benth. Introduced PRST3

  Argentine screwbean · Fabaceae 1 county
• 
  Prunus armeniaca L. Introduced PRAR3

  apricot · Rosaceae 1 county
• 
  Prunus avium (L.) L. Introduced PRAV

  sweet cherry · Rosaceae 3 counties
• 
  Prunus cerasifera Ehrh. Introduced PRCE2

  cherry plum · Rosaceae 8 counties
• 
  Prunus domestica L. Introduced PRDO

  European plum · Rosaceae 1 county
• 
  Prunus domestica L. var. domestica Introduced PRDOD

  European plum · Rosaceae 1 county
• 
  Prunus dulcis (Mill.) D.A. Webb Introduced PRDU

  sweet almond · Rosaceae 6 counties
• 
  Prunus laurocerasus L. Introduced PRLA5

  cherry laurel · Rosaceae 2 counties
• 
  Prunus mahaleb L. Introduced PRMA

  Mahaleb cherry · Rosaceae 1 county
• 
  Prunus persica (L.) Batsch Introduced PRPE3

  peach · Rosaceae 4 counties