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Montana Field Guide

Montana Field Guides

Knotweed - Polygonum aviculare
Other Names:  Polygonum arenastrum

Exotic Species (not native to Montana)

Global Rank: GNR
State Rank: SNA

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 0

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General Description
Annual. Stems prostrate to ascending, branched at the base, 5–50 cm. Leaves short-petiolate; the blades linear-oblanceolate to elliptic, 3–30 mm long; stipules 3–15 mm long, lacerate. Flowers 2–5 mm long, 1 to 3 in leaf axils; pedicels erect, 2–5 mm long; tepals greenish with white or pink margins. Achene 3-sided, brown, 2–5 mm long (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Unknown/Undetermined
 


Range Comments
Introduced from Europe, widespread in N. America (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Summary of Observations Submitted for Montana
Number of Observations: 115

(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
Disturbed soil of grasslands, pond margins, roadsides, yards; plains, valleys to subalpine (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

References
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Citation for data on this website:
Knotweed — Polygonum aviculare.  Montana Field Guide.  .  Retrieved on , from