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Montana Field Guide

Montana Field Guides

Engelmann's Knotweed - Polygonum engelmannii
Other Names:  Polygonum douglasii ssp. engelmannii

Status Under Review

Global Rank: G5T3T5
State Rank: SNR

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 4

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General Description
Annual. Stems erect or ascending, angled, branched at the base, 2–10 cm. Leaves short-petiolate; the blades 5–15 mm long, linear-oblanceolate, reduced above; stipules glabrous, 2–3 mm long. Flowers ca. 2 mm long, 2 to 4 in upper leaf axils; pedicels reflexed, 1–3 mm long; tepals green with rose margins. Achene 3-sided, 1–2 mm long, shiny black (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Present
 


Range Comments
BC, AB south to NV, UT and CO (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Summary of Observations Submitted for Montana
Number of Observations: 1

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Relative Density

Recency

 

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



Habitat

References
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Citation for data on this website:
Engelmann's Knotweed — Polygonum engelmannii.  Montana Field Guide.  .  Retrieved on , from