Polygonum pensylvanicum (Pennsylvania smartweed)

Polygonum pensylvanicum L.

Persicaria bicornis (Raf.) Nieuwl.

Persicaria longistyla (Small) Small

Persicaria mississippiensis (Stanford) Small

Persicaria pensylvanica (L.) Small

Persicaria pensylvanica (L.) Small var. dura (Stanford) C.F. Reed

Polygonum bicorne Raf.

Polygonum longistylum Small

Polygonum longistylum Small var. omissum (Greene) Stanford

Polygonum mexicanum auct. non Small

Polygonum mississippiense Stanford

Polygonum mississippiense Stanford var. interius Stanford

Polygonum pensylvanicum L. var. durum Stanford

Polygonum pensylvanicum L. var. eglandulosum J.C. Myers

Polygonum pensylvanicum L. var. genuinum Fernald

Polygonum pensylvanicum L. var. laevigatum Fernald

Polygonum pensylvanicum L. var. rosiflorum J.B.S. Norton

Pennsylvania smartweed

Kingdom	Plantae	Plants, but not fungi, lichens, or algae
Subkingdom	Tracheobionta	Vascular plants—plants with a “circulatory system” for delivering water and nutrients
Division	Magnoliophyta	Flowering plants, also known as angiosperms
Class	Magnoliopsida	Dicotyledons—plants with two initial seed leaves
Subclass	Caryophyllidae	Cacti, many other succulents, carnivorous plants, and leadworts
Order	Caryophyllales	Includes cacti, carnations, amaranths, ice plants, and many carnivorous plants
Family	Polygonaceae	Knotweed or smartweed family
Genus	Polygonum	Greek poly, “many,” and gonu, “knee,” for the swollen jointed stems
Species	pensylvanicum	Of or from Pennsylvania

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Polygonum pensylvanicum description by Thomas H. Kent, last updated 25 May 2020.

Highly dubious ID. This doesn't look much like any of the Polygonums I have seen. Anyone have any ideas? · 9/15/2012 · Mt. Wachusett, Princeton, Massachusetts
≈ 11 × 10" (28 × 26 cm) ID is uncertain

Highly dubious ID. This doesn't look much like any of the Polygonums I have seen. Anyone have any ideas? · 9/15/2012 · Mt. Wachusett, Princeton, Massachusetts
≈ 12 × 8" (31 × 20 cm) ID is uncertain

Highly dubious ID. This doesn't look much like any of the Polygonums I have seen. Anyone have any ideas? · 9/15/2012 · Mt. Wachusett, Princeton, Massachusetts
≈ 17 × 12" (44 × 29 cm) ID is uncertain

Highly dubious ID. This doesn't look much like any of the Polygonums I have seen. Anyone have any ideas? · 9/15/2012 · Mt. Wachusett, Princeton, Massachusetts
≈ 6 × 4" (15 × 10 cm) ID is uncertain

Highly dubious ID. This doesn't look much like any of the Polygonums I have seen. Anyone have any ideas? · 9/15/2012 · Mt. Wachusett, Princeton, Massachusetts
≈ 24 × 16" (62 × 41 cm) ID is uncertain

Highly dubious ID. This doesn't look much like any of the Polygonums I have seen. Anyone have any ideas? · 9/15/2012 · Mt. Wachusett, Princeton, Massachusetts
≈ 11 × 7" (27 × 18 cm) ID is uncertain

Range:

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