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Montana Field Guide

Montana Field Guides

Water Smartweed - Polygonum amphibium
Other Names:  Persicaria amphibia, Polygonum coccineum


Global Rank: G5
State Rank: S5

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 6

External Links






 
General Description
Rhizomatous, aquatic perennial with glabrous to pubescent foliage. Stems prostrate or floating, rooting at the nodes, 15–100 cm. Leaves petiolate; the blades lanceolate with rounded to pointed tips, 2–20 cm long; stipules 1–2 cm long, glabrous or ciliate. Flowers 4–6 mm long, in a terminal spike-like panicle 1–10 cm long; tepals pink. Achene 2-sided, 2–4 mm long, shiny dark brown (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Present
 


Range Comments
Circumboreal south to most of U.S. (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Summary of Observations Submitted for Montana
Number of Observations: 36

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density

Recency

 

(Observations spanning multiple months or years are excluded from time charts)



Habitat
Shallow water of ponds, sloughs; plains, valleys, montane (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

References
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Citation for data on this website:
Water Smartweed — Polygonum amphibium.  Montana Field Guide.  .  Retrieved on , from