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Montana Field Guide

Montana Field Guides

Lady's Thumb Smartweed - Polygonum persicaria
Other Names:  Persicaria maculosa

Exotic Species (not native to Montana)

Global Rank: G3G5
State Rank: SNA

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 1

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General Description
Scabrous to sparsely puberulent annual. Stems erect to decumbent, rooting at the nodes, branched, 10–80 cm. Leaves short-petiolate; the blades lanceolate, 3–12 cm long, usually with a dark spot in the center that becomes obscure with drying; stipules brown below, scarious above, 4–10 mm long, papery, ciliate-margined, strigose to glabrous. Flowers 2–3 mm long, in cylindrical, compound racemes 1–3 cm long; pedicels 1–3 mm long, ascending; tepals 4 to 5, green below, white to pink above, 3-veined. Achene 2- to 3-sided, 2–3 mm long, shiny, black (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Unknown/Undetermined
 


Range Comments
Cosmopolitan, introduced throughout N. America; native to Europe (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Summary of Observations Submitted for Montana
Number of Observations: 5

(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
Moist soil of fields, gardens, roadsides, 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:
Lady's Thumb Smartweed — Polygonum persicaria.  Montana Field Guide.  .  Retrieved on , from