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Montana Field Guide

Montana Field Guides

Poke Knotweed - Polygonum phytolaccifolium
Other Names:  Aconogonon phytolaccifolium

Native Species

Global Rank: G5
State Rank: S4

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 3

External Links






 
General Description
Glabrous perennial from a branched, woody caudex. Stems erect, often branched above, 30–90 cm. Leaves petiolate; the blades broadly lanceolate, 5–12 cm long; stipules reddish-brown, glabrous, 1–3 cm long. Flowers 2–4 mm long, numerous in axillary and terminal, leafy-bracted panicles; pedicels 1–4 mm long; tepals green to white. Achene shiny, yellow-brown, 4–7 mm long, 3-winged (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Range Comments
WA to MT, south to CA and NV (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 1

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density

Recency

 

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



Habitat
Well-drained, non-calcareous soil of meadows, open forest, rock slides, usually on warm slopes; subalpine, alpine (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

References
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Citation for data on this website:
Poke Knotweed — Polygonum phytolaccifolium.  Montana Field Guide.  .  Retrieved on , from