| Family | Scientific Name | Common Name | Habitat | Distribution | Image |
|---|---|---|---|---|---|
| Polygonaceae | Polygonum achoreum | Bottomland forests, marshes, streambanks, also disturbed areas. | NS and NT south to CT, s. IL, MO, KS, CO, UT, NV, and OR. |  | |
| Polygonaceae | Polygonum argyrocoleon | Silver-sheath Knotweed, Persian Knotweed | Disturbed areas, especially saline. | Native of w. Asia. Reported for NC by Burk (1961), with collection at NCU. |  |
| Polygonaceae | Polygonum aviculare ssp. aviculare | Knotweed | Disturbed areas. | Native of Eurasia. |  |
| Polygonaceae | Polygonum aviculare ssp. depressum | Dooryard Knotweed | Bottomlands, marshes, disturbed areas. | Native of Europe. |  |
| Polygonaceae | Polygonum aviculare ssp. neglectum | Needle-leaf Knotweed | Fields, disturbed areas. | Native of Europe. Documented from scattered locations in s. PA (Rhoads & Klein 1993); DE, NJ, and MD (Kartesz 1999); and WV (as P. aviculare ssp. rurivagum) (Costea & Tardif 2003). |  |
| Polygonaceae | Polygonum aviculare ssp. rurivagum | Disturbed areas. | |||
| Polygonaceae | Polygonum buxiforme | Small's Knotweed | Bottomlands, swamps, marshes, also disturbed areas, roadsides. | NL (Newfoundland), NL (Labrador), NU, and NT, variously reported south to SC, AL, MS, LA, TX, and CA. |  |
| Polygonaceae | Polygonum erectum | Erect Knotweed | Bottomland forests, streambanks, disturbed areas, open places. | ME, ON, and AB south to GA, LA, and NM. | |
| Polygonaceae | Polygonum glaucum | Seabeach Knotweed, Seaside Knotweed | Ocean beaches, sound-side sandy shores, dune bases. | Along the coast, MA south to ne. FL; also in Panhandle FL and s. AL (perhaps not native on the Gulf Coast). |  |
| Polygonaceae | Polygonum patulum | Red Knotgrass | On ballast, presumably just a waif. | Native of Mediterranean Europe and n. Africa. | |
| Polygonaceae | Polygonum plebeium | Common Knotweed | Waif at old sea-port. | Native of Europe. | |
| Polygonaceae | Polygonum prolificum | Longfruit Knotweed, Bushy Knotweed, Prolific Knotweed | Brackish marshes, disturbed areas. | PE, QC, MB, and BC, south to GA, AL, LA, TX. |  |
| Polygonaceae | Polygonum ramosissimum | Brackish marshes and shores; overwash flats, dunes. | NS west to NU and BC, south to GA, LA, TX, CA. Reported for SC (Kartesz 1999). |  | |
| Polygonaceae | Polygonum striatulum | Seasonally moist areas in sterile prairies or in seasonal seepage on granite. | Endemic to TX. |
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