Pennsylvania smartweed
(Persicaria pensylvanica)
Conservation • Wetland • Description • Habitat • Ecology • Use • Distribution • Taxonomy
Conservation Status |
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| IUCN Red List | not listed |
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| NatureServe | N5 - Secure SNR - Unranked |
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| Minnesota | not listed |
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Wetland Indicator Status |
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| Great Plains | FACW - Facultative wetland |
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| Midwest | FACW - Facultative wetland |
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| Northcentral & Northeast | FACW - Facultative wetland |
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Description |
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The leaves may have a faint, dark, chevron-shaped mark in the middle of the blade. The flowers are usually pink, but may also be white. The membrane sheathing each node (ocrea) is not fringed at the tip. The flowers always have 5 tepals. |
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Height |
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24″ to 72″ |
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Flower Color |
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White to pink |
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Similar Species |
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Spotted lady’s thumb (Persicaria maculosa) always has a dark spot in the middle of the leaf blade. The ocrea is fringed with bristles at the tip. The flowers may have 4 or 5 tepals. |
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Habitat |
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Wet to moist. Prairies, swamps, marsh edges, roadsides, railroads, disturbed sites. Full or partial sun. |
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Ecology |
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Flowering |
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July to September |
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Pests and Diseases |
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Use |
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Distribution |
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Sources |
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| 4/5/2023 | ||||
Nativity |
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Native |
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Occurrence |
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Common |
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Taxonomy |
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| Kingdom | Plantae (green algae and land plants) | ||
| Subkingdom | Viridiplantae (green plants) | ||
| Infrakingdom | Streptophyta (land plants and green algae) | ||
| Superdivision | Embryophyta (land plants) | ||
| Division | Tracheophyta (vascular plants) | ||
| Subdivision | Spermatophytina (seed plants) | ||
| Class | Magnoliopsida (flowering plants) | ||
| Superorder | Caryophyllanae | ||
Order |
Caryophyllales (pinks, cactuses, and allies) | ||
Family |
Polygonaceae (knotweed) | ||
| Subfamily | Polygonoideae | ||
| Tribe | Persicarieae | ||
| Subtribe | Persicariinae | ||
Genus |
Persicaria (knotweeds, smartweeds, and waterpeppers) | ||
Subordinate Taxa |
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Synonyms |
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Persicaria bicornis Persicaria longistyla Persicaria mississippiensis Persicaria pensylvanica var. dura Polygonum bicorne Polygonum longistylum Polygonum longistylum var. omissum Polygonum mexicanum Polygonum mississippiense Polygonum mississippiense var. interius Polygonum pensylvanicum var. durum Polygonum pensylvanicum var. eglandulosum Polygonum pensylvanicum var. genuinum Polygonum pensylvanicum var. laevigatum Polygonum pensylvanicum var. rosiflorum |
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Common Names |
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Pennsylvania smartweed pink knotweed pinkweed pinweed |
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Visitor Photos |
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MinnesotaSeasons.com Photos |
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Plant |
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Inflorescence |
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Leaves |
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Compare Pennsylvania smartweed on the left with curlytop knotweed on the right |
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Slideshows |
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| Persicaria pensylvanica (Pinkweed) Allen Chartier |
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| Polygonum pensylvanicum PINKWEED Frank Mayfield |
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Visitor Videos |
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MinnesotaSeasons.com Sightings |
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