Search Field Guide
Advanced Search
MT Gov Logo
Montana Field Guide

Montana Field Guides

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

No photos are currently available
If you have a high quality photo of this species, are confident in the identification, and would like to submit it for inclusion on the Montana Field Guide, please send it to us using our online photo submission tool.


Status Under Review
Native Species

Global Rank: G5T3T5
State Rank: SNR
C-value: 4


Agency Status
USFWS:
USFS:
BLM:


 

External Links






 
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 et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

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

Habitat

Ecology
POLLINATORS
The following animal species have been reported as pollinators of this plant species or its genus where their geographic ranges overlap: Bombus bifarius, Bombus flavifrons, Bombus frigidus, Bombus melanopygus, Bombus sylvicola, Bombus occidentalis, Bombus pensylvanicus, Bombus insularis, and Bombus kirbiellus (Macior 1974, Colla and Dumesh 2010).

References
  • Literature Cited AboveLegend:   View Online Publication
    • Colla, S.R. and S. Dumesh. 2010. The bumble bees of southern Ontario: notes on natural history and distribution. Journal of the Entomological Society of Ontario 141:39-68.
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
    • Macior, L.M. 1974. Pollination ecology of the Front Range of the Colorado Rocky Mountains. Melanderia 15: 1-59.
  • Additional ReferencesLegend:   View Online Publication
    Do you know of a citation we're missing?
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2022. Manual of Montana Vascular Plants, Second Edition. Fort Worth, TX: BRIT Press. viii + 779 p.
  • Web Search Engines for Articles on "Engelmann's Knotweed"
Login Logout
Citation for data on this website:
Engelmann's Knotweed — Polygonum engelmannii.  Montana Field Guide.  .  Retrieved on , from