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Montana Field Guide

Montana Field Guides

Erect Knotweed - Polygonum erectum

Status Under Review

Global Rank: G5
State Rank: SNR

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 2

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General Description
Annual. Stems erect, branched, 10–50 cm. Leaves crowded, lanceolate to elliptic, veiny, short-petiolate, 15–40 mm long; stipules 4–8 mm long, shredding into fibers. Flowers 3–4 mm long, 1 to 5 in leaf axils; pedicels erect, 3–7 mm long; tepals green with yellowish margins. Achene 3-angled, tan, 2–4 mm long (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Present
 


Range Comments
AB to QC south to NV, NM, LA and AL (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Summary of Observations Submitted for Montana
Number of Observations: 6

(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 areas of grasslands, fields, roadsides; 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:
Erect Knotweed — Polygonum erectum.  Montana Field Guide.  .  Retrieved on , from