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Common Smartweeds (Polygonum) in Illinois Wetlands
Wetland Plants: Identify common smartweeds (Polygonum/Persicaria) in Illinois wetlands from photos
7
Plant Sciences
Professional
05/04/2012

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Term

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  • Sheaths without bristles. 
  • Perennials with rhizomes or stolons. 
  • Sepals red or pink. Spikes conical to ovoid, usually less than 4cm long. 
  • Peduncles densly pubescent. 
  • Stipules without a flange.
Definition

Polygonum amphibium

Water Smartweed/Water Knotweed

 

OBL

Term

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  • Sheaths with bristles. 
  • Annuals with fiberous roots or perenials with slender rhizomes. 
  • Spikes more than 2 per stem. 
  • Peduncles without stipitate glands. 
  • Sepals punctate or glandular dotted. 
  • Racemes mostly continuous.
  • Sepals often with a pinkish or greenish tinge. 
  • Achenes dull.
Definition

Persicaria hydropiper/Polygonum hydropiper

Water Pepper

 

OBL

Term

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  • Sheaths with bristles. 
  • Perenials with slender rhizomes. 
  • Spikes more than 2 per stem. 
  • Peduncles without stipitate glands. 
  • Sepals neither punctate nor glandular dotted
  • Sepals rosy or pinkish.
  • Racemes interrupted. 
Definition

Persicaria hydropiperoides/Polygonum hydropiperoides

Mild Water Pepper

 

OBL

Term

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  • Sheaths without bristles. 
  • Annuals with fiberous roots. 
  • None of the flowers with exerted stamens or styles. 
  • Spikes arching or pendulous.
  • Achnes up to 2mm broad 
  • Sepals usually white.
Definition

Persicaria lapathifolia/Polygonum lapathifolium

Curttop Lady's Thumb/Pale Smartweed

 

FACW+

Term

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  • Sheaths without bristles. 
  • Annuals with fiberous roots. 
  • None of the flowers with exerted stamens or styles. 
  • Spikes not arching
  • Achenes broader than 2mm
  • Sepals pink.
Definition

Persicaria pensylvanica/Polygonum pensylvanicum

Pinkweed

 

FACW+

Term

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  • Sheaths with bristles. 
  • Annuals with fiberous roots. 
  • Spikes more than 2 per stem. 
  • Peduncles without stipitate glands. 
  • Sepals neither punctate nor glandular dotted. 
  • Racemes crowded. 
  • Flowers pink or pale pink. 
  • Racemes often more than 7mm thick. 
  • Leaves often with a dark blotch.
Definition

Persicaria maculosa/Persicaria vulgaris/Polygonum persicaria

Lady's Thumb-print

 

FACW+

Term

 [image][image]

  • Sheaths with bristles. 
  • Annuals with fiberous roots or perenials with slender rhizomes. 
  • Spikes more than 2 per stem. 
  • Peduncles without stipitate glands. Sepals punctate or glandular dotted. Racemes usually interrupted; sepals white; achenes shiny.
Definition

Persicaria punctata/Polygonum punctatum

Dotted Smartweed

 

OBL

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