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Engelmann's Knotweed - Polygonum engelmannii
Other Names:
Polygonum douglasii ssp. engelmannii
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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 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 ).
Observations in Montana Natural Heritage Program Database
Number of Observations: 1
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Relative Density
Recency
(Observations spanning multiple months or years are excluded from time charts)
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
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