Synonyms: Polygonum incarnatum, Polygonum lapathifolium.
Curlytop Knotweed is one of our more common native plants in the genus Persicaria. It is very similar to the non-native Far-eastern Smartweed (Persicaria extremiorientalis). Great care needs to be taken when trying to identify both species. Robert Naczi says the best way to identify these two species is to examine the tepals, "If I know it's either Persicaria lapathifolia or Persicaria extremiorientalis, I find it easiest to examine the tepals. Those of Persicaria lapathifolia have upside-down anchors. Each main vein splits into two arches that recurve forming a pattern like an inverted anchor. These veins are the single best diagnostic character of Periscaria lapathifolia. Persicaria extremiorientalis, on the other hand, lacks "anchor veins."
There are 50 records in the project database.
| GA | AL | WA | FR | CL | MO | HO | BA | BC | HA | CE | PG | AA | CV | CH | SM | KE | QA | CN | TA | DO | WI | SO | WO |
