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Montana Field Guide

Montana Field Guides

White-margin Knotweed - Polygonum polygaloides


Global Rank: G4G5
State Rank: S3S4

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

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General Description
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).

Phenology
Flowering in July, fruiting in August.

Range Comments
BC to SK south to CA, AZ, NM (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Habitat
Moist, sparsely vegetated soil, often around ponds in the valleys and montane zone.

References
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Citation for data on this website:
White-margin Knotweed — Polygonum polygaloides.  Montana Field Guide.  .  Retrieved on , from