Contains 15 accepted taxa overall.
Characteristics
Classification
Citation
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Species
| Scientific Name | Common Name | Status | Photos |
|---|---|---|---|
| Polygonum achoreum | Blake’s knotweed | Native FACU, FAC (NWPL) FACU (NWPL EMP) FACU (NWPL NCNE) S4 (State Rank) G5 (Global Rank) | |
| Polygonum articulatum | northern jointweed | Native S4 (State Rank) | |
| Polygonum aviculare | FACU (NWPL EMP) FACU (NWPL NCNE) | ||
| Polygonum aviculare ssp. aviculare | common knotweed | Not Native Naturalized FACU (NWPL EMP) FACU (NWPL NCNE) SNA (State Rank) | |
| Polygonum aviculare ssp. depressum | oval-leaved knotweed | Not Native Naturalized FACU (NWPL EMP) FACU (NWPL NCNE) SNA (State Rank) | |
| Polygonum aviculare ssp. neglectum | narrow-leaved knotweed | Not Native Naturalized FACU (NWPL EMP) FACU (NWPL NCNE) SNA (State Rank) G5 (Global Rank) | |
| Polygonum buxiforme | American knotweed | Native Endangered-State FACU (NWPL EMP) FACU (NWPL NCNE) S1S2 (State Rank) G5 (Global Rank) | |
| Polygonum douglasii | Douglas’s knotweed | Native Threatened-State UPL, FAC (NWPL) UPL (NWPL EMP) FACU (NWPL NCNE) S1S2 (State Rank) G5 (Global Rank) | |
| Polygonum erectum | erect knotweed | Native FACU-, OBL (NWPL) FACU (NWPL EMP) FACU (NWPL NCNE) S2S3 (State Rank) G5 (Global Rank) | |
| Polygonum glaucum | seabeach knotweed | Native Rare-State FACU (NWPL EMP) FACU (NWPL NCNE) S3 (State Rank) | |
| Polygonum polycnemoides | Himalayan knotweed | Not Native SNA (State Rank) | |
| Polygonum ramosissimum | FAC (NWPL EMP) FAC (NWPL NCNE) | ||
| Polygonum ramosissimum ssp. prolificum | proliferous knotweed | Native FAC (NWPL EMP) FAC (NWPL NCNE) S4 (State Rank) G5T4T5 (Global Rank) | |
| Polygonum ramosissimum ssp. ramosissimum | bushy knotweed | Native FAC (NWPL EMP) FAC (NWPL NCNE) S4 (State Rank) G5T5 (Global Rank) | |
| Polygonum tenue | pleated-leaved knotweed | Native Rare-State S3 (State Rank) G5 (Global Rank) |