| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| POBU5 | Polygonum buxifolium Nutt. ex Bong. | Polygonum fowleri | Polygonaceae
|
| POBUM | Polygonum buxiforme Small var. montanum (Small) R.J. Davis | Polygonum douglasii ssp. douglasii | Polygonaceae
|
| POBU2 | Polygonum buxiforme Small | box knotweed | Polygonaceae
|
| POCAC4 | Polygonum caespitosum Blume var. ?caespitosum | oriental ladysthumb | Polygonaceae
|
| POCAL2 | Polygonum caespitosum Blume var. longisetum (de Bruyn) A.N. Steward | oriental ladysthumb | Polygonaceae
|
| POCA49 | Polygonum caespitosum Blume | oriental ladysthumb | Polygonaceae
|
| POCA7 | Polygonum californicum Meisn. | California knotweed | Polygonaceae
|
| POCA20 | Polygonum campanulatum Hook. f. | bellflower smartweed | Polygonaceae
|
| POCA28 | Polygonum camporum Meisn. | Polygonum striatulum | Polygonaceae
|
| POCA21 | Polygonum capitatum Buch.-Ham. ex D. Don | pinkhead smartweed | Polygonaceae
|
| POCA8 | Polygonum careyi Olney | Carey's smartweed | Polygonaceae
|
| POCA9 | Polygonum cascadense W.H. Baker | Cascade knotweed | Polygonaceae
|
| POCA10 | Polygonum caurianum B.L. Robins. | Alaska knotweed | Polygonaceae
|
| POCE5 | Polygonum cephalophorum Greene | Polygonum bistortoides | Polygonaceae
|
| POCEC | Polygonum cespitosum Blume var. cespitosum Blume [orthographic variant] | Polygonum caespitosum var. caespitosum | Polygonaceae
|
| POCEL | Polygonum cespitosum Blume var. longisetum (de Bruyn) A.N. Steward [orthographic variant] | Polygonum caespitosum var. longisetum | Polygonaceae
|
| POCE4 | Polygonum cespitosum Blume [orthographic variant] | Polygonum caespitosum | Polygonaceae
|
| POCH6 | Polygonum chinense L. | Chinese knotweed | Polygonaceae
|
| POCIL | Polygonum cilinode Michx. var. laevigatum Fern. | Polygonum cilinode | Polygonaceae
|
| POCI | Polygonum cilinode Michx. | fringed black bindweed | Polygonaceae
|
| POCOM3 | Polygonum coarctatum Dougl. ex Hook. f. var. majus Meisn. | Polygonum douglasii ssp. majus | Polygonaceae
|
| POCOP4 | Polygonum coccineum Muhl. ex Willd. var. pratincola (Greene) Stanford | Polygonum amphibium var. emersum | Polygonaceae
|
| POCOR2 | Polygonum coccineum Muhl. ex Willd. var. rigidulum (Sheldon) Stanford | Polygonum amphibium var. stipulaceum | Polygonaceae
|
| POCOT | Polygonum coccineum Muhl. ex Willd. var. terrestre Willd. | Polygonum amphibium var. emersum | Polygonaceae
|
| POCO8 | Polygonum coccineum Muhl. ex Willd. | Polygonum amphibium var. emersum | Polygonaceae
|
| POCO9 | Polygonum confertiflorum Nutt. ex Piper | Polygonum polygaloides ssp. confertiflorum | Polygonaceae
|
| POCOC2 | Polygonum convolvulus L. var. convolvulus | black bindweed | Polygonaceae
|
| POCOS | Polygonum convolvulus L. var. subulatum Lej. & Court. | black bindweed | Polygonaceae
|
| POCO10 | Polygonum convolvulus L. | black bindweed | Polygonaceae
|
| POCR9 | Polygonum cristatum Engelm. & Gray | Polygonum scandens var. cristatum | Polygonaceae
|
| POCUC2 | Polygonum cuspidatum Sieb. & Zucc. var. compactum (Hook f.) Bailey | Polygonum cuspidatum | Polygonaceae
|
| POCU6 | Polygonum cuspidatum Sieb. & Zucc. | Japanese knotweed | Polygonaceae
|
| PODA | Polygonum davisiae Brewer ex Gray | Davis' knotweed | Polygonaceae
|
| PODE2 | Polygonum densiflorum Meisn. | denseflower knotweed | Polygonaceae
|
| PODOA2 | Polygonum douglasii Greene ssp. austiniae (Greene) E. Murr. | Austin knotweed | Polygonaceae
|
| PODOD4 | Polygonum douglasii Greene ssp. douglasii | Douglas' knotweed | Polygonaceae
|
| PODOE | Polygonum douglasii Greene ssp. engelmannii (Greene) Kartesz & Gandhi | Engelmann's knotweed | Polygonaceae
|
| PODOJ2 | Polygonum douglasii Greene ssp. johnstonii (Munz) Hickman | Johnston's knotweed | Polygonaceae
|
| PODOM2 | Polygonum douglasii Greene ssp. majus (Meisn.) Hickman | large knotweed | Polygonaceae
|
| PODON | Polygonum douglasii Greene ssp. nuttallii (Small) Hickman | Nuttall's knotweed | Polygonaceae
|
| PODOS2 | Polygonum douglasii Greene ssp. spergulariiforme (Meisn. ex Small) Hickman | scatter knotweed | Polygonaceae
|
| PODOA | Polygonum douglasii Greene var. austiniae (Greene) M.E. Jones | Polygonum douglasii ssp. austiniae | Polygonaceae
|
| PODOJ | Polygonum douglasii Greene var. johnstonii Munz | Polygonum douglasii ssp. johnstonii | Polygonaceae
|
| PODOL | Polygonum douglasii Greene var. latifolium (Engelm.) Greene | Polygonum douglasii ssp. douglasii | Polygonaceae
|
| PODOM4 | Polygonum douglasii Greene var. microspermum (Engelm.) Dorn | Polygonum douglasii ssp. engelmannii | Polygonaceae
|
| PODO4 | Polygonum douglasii Greene | Douglas' knotweed | Polygonaceae
|
| PODU3 | Polygonum dubium Stein | Polygonum persicaria | Polygonaceae
|
| PODUS | Polygonum dumetorum L. var. scandens (L.) Gray | Polygonum scandens var. scandens | Polygonaceae
|
| PODU4 | Polygonum dumetorum L. | Polygonum scandens var. dumetorum | Polygonaceae
|
| POEM3 | Polygonum emaciatum A. Nels. | Polygonum douglasii ssp. douglasii | Polygonaceae
|
| POEN | Polygonum engelmannii Greene | Polygonum douglasii ssp. engelmannii | Polygonaceae
|
| POERA | Polygonum erectum L. ssp. achoreum (S.F. Blake) A.& D. L�ve | Polygonum achoreum | Polygonaceae
|
| POER2 | Polygonum erectum L. | erect knotweed | Polygonaceae
|
| POES | Polygonum esotericum L.C. Wheeler | Polygonum polygaloides ssp. esotericum | Polygonaceae
|
| POEX4 | Polygonum exsertum auct. p.p. non Small | Polygonum ramosissimum var. ramosissimum | Polygonaceae
|
| POFA4 | Polygonum fagopyrum L. | Fagopyrum esculentum | Polygonaceae
|
| POFI7 | Polygonum fimbriatum Ell. | Polygonella fimbriata | Polygonaceae
|
| POFL12 | Polygonum fluitans Eat. | Polygonum amphibium var. stipulaceum | Polygonaceae
|
| POFO2 | Polygonum fowleri B.L. Robins. | Fowler's knotweed | Polygonaceae
|
| POFU3 | Polygonum fugax Small | Polygonum viviparum | Polygonaceae
|
| POFU | Polygonum fusiforme Greene | Polygonum persicaria | Polygonaceae
|
| POGL10 | Polygonum glabrum sensu Cham. & Schlecht., non Willd. | Polygonum densiflorum | Polygonaceae
|
| POGL12 | Polygonum glastifolium Greene | Polygonum bistortoides | Polygonaceae
|
| POGL7 | Polygonum glaucum Nutt. | seaside knotweed | Polygonaceae
|
| POGR14 | Polygonum gracile Nutt. | Polygonella gracilis | Polygonaceae
|
| POGR16 | Polygonum greenii S. Wats. | Polygonum californicum | Polygonaceae
|
| POHA13 | Polygonum hartwrightii Gray | Polygonum amphibium var. stipulaceum | Polygonaceae
|
| POHE18 | Polygonum herniarioides Delile | | Polygonaceae
|
| POHE14 | Polygonum heterophyllum Lindl. | Polygonum aviculare | Polygonaceae
|
| POHE2 | Polygonum heterosepalum M.E. Peck & Ownbey | oddsepal knotweed | Polygonaceae
|
| POHI14 | Polygonum hickmanii H. Hinds & R. Morgan | Hickman's knotweed | Polygonaceae
|
| POHI3 | Polygonum hirsutum Walt. | hairy smartweed | Polygonaceae
|
| POHU3 | Polygonum humifusum Pallas | Polygonum caurianum | Polygonaceae
|
| POHYP | Polygonum hydropiper L. var. projectum Stanford | Polygonum hydropiper | Polygonaceae
|
| POHY | Polygonum hydropiper L. | marshpepper knotweed | Polygonaceae
|
| POHYA | Polygonum hydropiperoides Michx. var. adenocalyx (Stanford) Gleason | Polygonum hydropiperoides | Polygonaceae
|
| POHYA2 | Polygonum hydropiperoides Michx. var. asperifolium Stanford | Polygonum hydropiperoides | Polygonaceae
|
| POHYB | Polygonum hydropiperoides Michx. var. breviciliatum Fern. | Polygonum hydropiperoides | Polygonaceae
|
| POHYB2 | Polygonum hydropiperoides Michx. var. bushianum Stanford | Polygonum hydropiperoides | Polygonaceae
|
| POHYD | Polygonum hydropiperoides Michx. var. digitatum Fern. | Polygonum hydropiperoides | Polygonaceae
|
| POHYE | Polygonum hydropiperoides Michx. var. euronotorum Fern. | Polygonum hydropiperoides | Polygonaceae
|
| POHYO | Polygonum hydropiperoides Michx. var. opelousanum (Riddell ex Small) Riddell ex W. Stone | Polygonum hydropiperoides | Polygonaceae
|
| POHYP2 | Polygonum hydropiperoides Michx. var. psilostachyum St. John | Polygonum hydropiperoides | Polygonaceae
|
| POHYS2 | Polygonum hydropiperoides Michx. var. setaceum (Baldw.) Gleason | Polygonum setaceum | Polygonaceae
|
| POHYS | Polygonum hydropiperoides Michx. var. strigosum (Small) Stanford | Polygonum hydropiperoides | Polygonaceae
|
| POHY2 | Polygonum hydropiperoides Michx. | swamp smartweed | Polygonaceae
|
| POIM2 | Polygonum imbricatum Nutt. | Polygonum polygaloides ssp. confertiflorum | Polygonaceae
|
| POIN22 | Polygonum incanum F.W. Schmidt | Polygonum lapathifolium | Polygonaceae
|
| POIN19 | Polygonum incarnatum Ell. | Polygonum lapathifolium | Polygonaceae
|
| POIN16 | Polygonum interius Brenckle | Polygonum ramosissimum var. ramosissimum | Polygonaceae
|
| POIN14 | Polygonum inundatum Raf. | Polygonum amphibium var. stipulaceum | Polygonaceae
|
| POKEC | Polygonum kelloggii Greene var. confertiflorum (Nutt. ex Piper) Dorn | Polygonum polygaloides ssp. confertiflorum | Polygonaceae
|
| POKE2 | Polygonum kelloggii Greene | Polygonum polygaloides ssp. kelloggii | Polygonaceae
|
| POLA22 | Polygonum lacerum Kunth | | Polygonaceae
|
| POLAP | Polygonum lapathifolium L. ssp. pallidum (With.) Fries | Polygonum lapathifolium | Polygonaceae
|
| POLAI | Polygonum lapathifolium L. var. incanum (F.W. Schmidt) W.D.J. Koch | Polygonum lapathifolium | Polygonaceae
|
| POLAN2 | Polygonum lapathifolium L. var. nodosum (Pers.) Small | Polygonum lapathifolium | Polygonaceae
|
| POLAO | Polygonum lapathifolium L. var. ovatum A. Braun | Polygonum lapathifolium | Polygonaceae
|
| POLAP2 | Polygonum lapathifolium L. var. prostratum C.F.H. Wimmer | Polygonum lapathifolium | Polygonaceae
|
| POLAS | Polygonum lapathifolium L. var. salicifolium Sibthorp | Polygonum lapathifolium | Polygonaceae
|
| POLA4 | Polygonum lapathifolium L. | curlytop knotweed | Polygonaceae
|