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Montana Field Guide

Montana Field Guides

Marshpepper Smartweed - Polygonum hydropiper
Other Names:  Persicaria hydropiper

Exotic Species (not native to Montana)

Global Rank: GNR
State Rank: SNA

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 1

External Links






 
General Description
Glandular-punctate annual. Stems erect to prostrate, sometimes rooting at the nodes, branched, 8–80 cm. Leaves short-petiolate; the blades lanceolate to elliptic, 2–8 cm long; stipules brown, 5–15 mm long, papery, sparsely ciliate-margined. Flowers 2–4 mm long, in narrow terminal racemes 1–7 cm long; pedicels 1–3 mm long, ascending; tepals 4 to 5, densely glandular-punctate, green with white or pink margins, 3-veined. Achene 2- to 3-sided, 2–3 mm long, brown with a dull granular surface (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Unknown/Undetermined
 


Range Comments
Throughout temperate N. America; introduced from Europe (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Summary of Observations Submitted for Montana
Number of Observations: 1

(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
Mud along margins of wetlands, streams; plains, valleys. (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).)

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