White-margin Knotweed - Polygonum polygaloides
Annual. Stems erect or ascending, 4-angled, simple or branched at the base, 1–5 cm. Leaves sessile, 5–20 mm long, linear; stipules glabrous, 2–5 mm long. Flowers 1–3 mm long, axillary and in a dense, terminal, bracteate raceme; bracts linear to ovate; pedicels 0–2 mm long; tepals white to rose with a green midrib. Achene 3-sided, 1–3 mm long, shiny or dull brown (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX)
Flowering in July, fruiting in August.
BC to SK south to CA, AZ, NM (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).
Observations in Montana Natural Heritage Program Database
Number of Observations:
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Moist, sparsely vegetated soil, often around ponds in the valleys and montane zone.
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).
- 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.
- Macior, L.M. 1974. Pollination ecology of the Front Range of the Colorado Rocky Mountains. Melanderia 15: 1-59.
- Additional ReferencesLegend: View Online Publication
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- Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.