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Persicaria setacea (Baldwin) Small. Section: Persicaria. Swamp Smartweed. Phen: Jul-Nov. Hab: Swamp forests, bottomland forests. Dist: MA, MI, MO, and OK south to s. FL and TX. Discovered in Ripley County, IN (S. Namestnik, pers.comm. 2022).

Origin/Endemic status: Native

Synonymy ⓘ: = Ar, Fl4, FNA5, Il, K3, K4, 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, K1; > Polygonum setaceum Baldwin var. setaceum – F, K1; > Polygonum setaceum Baldwin var. tonsum Fernald – F, K1

Links to other floras: = Persicaria setacea - FNA5

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Wetland Indicator Status:

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

Heliophily ⓘ: 6

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image of plant© Gary P. Fleming | Original Image ⭷
image of plant© Richard & Teresa Ware CC-BY-NC, permission granted to NCBG | Original Image ⭷
image of plant© Gary P. Fleming | Original Image ⭷
image of plant© Bruce A. Sorrie | Original Image ⭷
image of plant© Gary P. Fleming | Original Image ⭷

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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: