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Montana Field Guide

Montana Field Guides

Poke Knotweed - Polygonum phytolaccifolium
Other Names:  Aconogonon phytolaccifolium


Global Rank: G5
State Rank: S4

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

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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).

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