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Polygonum erectum Linnaeus. Erect Knotweed. Phen: Jun-Oct; Jul-Oct. Hab: Bottomland forests, streambanks, disturbed areas, open places. Dist: ME, ON, and AB south to GA, LA, and NM.

Origin/Endemic status: Native

Synonymy ⓘ: = Ar, C, F, FNA5, GrPl, Il, K1, K3, K4, Mi, NE, NY, Pa, RAB, S, S13, Tn, Va, W, WV, Horton (1972), Mitchell & Dean (1978)

Links to other floras: = Polygonum erectum - FNA5

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Wetland Indicator Status:

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

Heliophily ⓘ: 7

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image of plant© Keith Bradley | Original Image ⭷
image of plant© Gary P. Fleming | Original Image ⭷
image of plant© Radford, Ahles and Bell | Original Image ⭷

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Horticultural Information

NCBG trait

Intro: Erect-ascending annual of alluvial fields, stream banks, sand and gravel bars and open, disturbed areas.

Stems: Stems freely branched, hard and ribbed, with somewhat swollen nodes.

Leaves: Leaves alternate, short-petiolate and with a silvery membranous sheath (ocrea) where petiole joins stem, elliptic to lance-shaped, 1/2-3 in. long, firm, yellowish-green.

Inforescence:

Flowers: Flowers in sessile to short-stalked, axillary clusters of 1-5; greenish-white; 1/8 in. wide; consisting of 5 green, oblong tepals with bluntly rounded tips and yellow to whitish margins.

Fruits: Fruit a tiny, brown achene.

Comments:

Height: 8-30 in.

plant sale text:

bloom table text:

description: Erect-ascending annual of alluvial fields, stream banks, sand and gravel bars and open, disturbed areas.

stems: Stems freely branched, hard and ribbed, with somewhat swollen nodes.

leaves: Leaves alternate, short-petiolate and with a silvery membranous sheath (ocrea) where petiole joins stem, elliptic to lance-shaped, 1/2-3 in. long, firm, yellowish-green.

inflorescence:

flowers: Flowers in sessile to short-stalked, axillary clusters of 1-5; greenish-white; 1/8 in. wide; consisting of 5 green, oblong tepals with bluntly rounded tips and yellow to whitish margins.

fruits: Fruit a tiny, brown achene.

comments:

cultural notes:

germination code:

native range: