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Montana Field Guide

Montana Field Guides

Bushy Knotweed - Polygonum ramosissimum
Other Names:  Polygonum leptocarpum


Global Rank: G5
State Rank: SU

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

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General Description
Stems erect, branched, 8–70 cm high. Leaves short-petiolate, often moldy beneath, linear to narrowly lanceolate, 1–3 cm long,; stipules 5–14 mm long, lacerate, brownish. Flowers 2–4 mm long, 1 to 3 in leaf axils; pedicels 1–6 mm long, erect; tepals green with yellow or white to pink margins. Achene dark brown, 3-sided (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Our plants are subspecies ramosissimum.

Species Range
Present
 


Range Comments
Throughout N. America (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Summary of Observations Submitted for Montana
Number of Observations: 23

(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
Grasslands, roadsides, ephemeral wetlands; plains, valleys (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

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