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Montana Field Guide

Montana Field Guides

Bushy Knotweed - Polygonum ramosissimum
Other Names:  [includes] Polygonum leptocarpum

Native/Exotic Species
(depends on location or taxa)


Global Rank: G5
State Rank: SU

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

External Links






 
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. The Great Plains Flora includes P. leptocarpum in its treatment.

Species Range
Present
 


Range Comments
Throughout N. America (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX). Native to eastern North America, but possibly introduced west of the Continental Divide (Lesica 2012).

Summary of Observations Submitted for Montana
Number of Observations: 25

(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