Copy permalink to share
Polygonaceae
Persicaria

not marked as a favorite taxon Persicaria setacea (Baldwin) Small. Common name: Swamp Smartweed. Phenology: Jul-Nov. Habitat: Swamp forests, bottomland forests. Distribution: MA, MI, MO, and OK south to s. FL and TX. Discovered in Ripley County, IN (S. Namestnik, pers.comm. 2022).

Glossary (beta!)

Section: Persicaria.

Origin/Endemic status: Native

Synonymy ⓘ: = Ar, Fl4, FNA5, Il, K4, Mo3, NE, NY, Pa, S, S13, Tn, Tx, Va; = Polygonum hydropiperoides Michx. var. setaceum (Baldwin) Gleason — C, G; = Polygonum setaceum Baldwin — GW2, NcTx, RAB, Tat, W, WH3, Horton (1972), Mitchell & Dean (1978); > Polygonum setaceum Baldwin var. interjectum Fernald — F; > Polygonum setaceum Baldwin var. setaceum — F; > Polygonum setaceum Baldwin var. tonsum Fernald — F. Basionym: Polygonum setaceum Baldwin 1821

Links to other floras: = Persicaria setacea - FNA5

Show in key(s)

Show parent genus | Show parent in key(s)

Wetland Indicator Status:

  • Atlantic and Gulf Coastal Plain: OBL
  • Eastern Mountains and Piedmont: OBL
  • Great Plains: OBL
  • Midwest: OBL
  • Northcentral & Northeast: OBL

Heliophily ⓘ: 6

Your browser does not support SVGs

Hover over a shape, letter, icon, or arrow on the map for definition or see the legend.

image #1 of Persicaria setacea© Gary P. Fleming | Original Image ⭷
image #2 of Persicaria setacea© Richard & Teresa Ware CC-BY-NC, permission granted to NCBG | Original Image ⭷
image #3 of Persicaria setacea© Gary P. Fleming | Original Image ⭷
image #4 of Persicaria setacea© Bruce A. Sorrie | Original Image ⭷
image #5 of Persicaria setacea© Gary P. Fleming | Original Image ⭷

Feedback

See something missing or incorrect about Persicaria setacea? Let us know here:
  1. Please include your name and if possible, email in case when need to clarify what you wrote.
  2. If you opt out of including email, please be as specific as possible (e.g., which photo is incorrect?)
  3. Please do not submit questions asking to identify plants or about horticultural topics (e.g., how do I control an invasive plant in my garden?). Instead, those questions can be submitted here for the Carolinas region only.
  4. Please do not send us feedback about unkeyed species as this work is ongoing.
  5. Please allow time for flora edits to show in our next data release. We greatly appreciate your feedback but may require extra time to research complicated taxonomic issues.

Horticultural Information

NCBG trait

Intro: Erect perennial of swamp and bottomland forests, brackish and maritime swamps.

Stems: Stems simple or branching from middle or upper nodes, slightly ridged, hairy.

Leaves: Leaves alternate, petiolate and with a long-fringed and hairy membranous sheath (ocrea) where petiole joins stem; lance-shaped to linear; 2 1/4-6 in. long; smooth or rough-hairy above and smooth or hairy beneath.

Inforescence:

Flowers: Flowers in erect, dense spikes at ends of branches; greenish-white to pinkish; less than 1/4 in. long; consisting of 5 tepals that are joined at the base and usually not fully spreading.

Fruits:

Comments:

Height: 1 1/2-4 ft.

plant sale text:

bloom table text:

description: Erect perennial of swamp and bottomland forests, brackish and maritime swamps.

stems: Stems simple or branching from middle or upper nodes, slightly ridged, hairy.

leaves: Leaves alternate, petiolate and with a long-fringed and hairy membranous sheath (ocrea) where petiole joins stem; lance-shaped to linear; 2 1/4-6 in. long; smooth or rough-hairy above and smooth or hairy beneath.

inflorescence:

flowers: Flowers in erect, dense spikes at ends of branches; greenish-white to pinkish; less than 1/4 in. long; consisting of 5 tepals that are joined at the base and usually not fully spreading.

fruits:

comments:

cultural notes:

germination code:

native range:



0 unsaved edits on this page.