Search Field Guide
Advanced Search
Montana Field Guide

Montana Field Guides

Dotted Smartweed - Polygonum punctatum
Other Names:  Persicaria punctata


Global Rank: G5
State Rank: S3S4
* (see State Rank Reason below)

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 4

External Links






State Rank Reason (see State Rank above)
Polygonum punctatum is known from about five counties. This species may be easily mis-identified or undercollected. More data on population sizes and distributions is needed before warranting it as a Species of Concern.
  • Details on Status Ranking and Review
    Dotted Smartweed (Polygonum punctatum) Conservation Status Review
    Review Date = 11/14/2016
    View State Conservation Rank Criteria
    Population Size

    ScoreU - Unknown

    Range Extent

    ScoreF - 10,000 - 100,000 individuals

    Area of Occupancy

    ScoreD - 6-25 4-km2 grid cells

    Number of Populations

    ScoreB - 6 - 20

    Number of Occurrences or Percent Area with Good Viability / Ecological Integrity

    ScoreB - Very few (1-3) occurrences with excellent or good viability or ecological integrity

    Environmental Specificity

    ScoreD - Broad. Generalist or community with all key requirements common

    Long-term Trend

    ScoreU - Unknown

    Trends

    ScoreU - Unknown

    Threats

    ScoreU - Unknown

    CommentThreats: Unknown/undetermined.

    Intrinsic Vulnerability

    ScoreC - Not intrinsically vulnerable

 
General Description
Plants: Rhizomatous-stoloniferous perennials (McGregor et al. 1986), glandular-punctate. Stems upright to prostrate or decumbent and rooting at the nodes, somewhat branched, up to 1 meter in length (Hitchcock et al. 1964).

Leaves: Short-petiolate; the blades with or without a central dark blotch, lanceolate to oblanceolate (Lesica 2012), (3)5-10(12) cm in length (Hitchcock et al. 1964), up to 2 cm in width, acuminate (McGregor et al. 1986), glandular-punctate and ciliate, otherwise usually smooth (Hitchcock et al. 1964); stipules (ocreae) brown and papery (Lesica 2012), enveloping the stem obliquely, 10-15 mm in length, typically with a few appressed hairs and several marginal bristles (Hitchcock et al. 1964).

Inflorescence: Flowers in erect or arching (McGregor et al. 1986), narrow, terminal and typically 2 to a few lateral racemes; racemes up to 10 cm in length (Hitchcock et al. 1964); flower clusters interrupted, particularly below, not crowded, the groups of flowers subtended by sheathing bracts (ocreolae) (McGregor et al. 1986); pedicels 1–4 mm in length, ascending (Lesica 2012).

(Lesica’s contribution adapted from Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX.)

Phenology
Flowers July-October (McGregor et al. 1964).

Diagnostic Characteristics
Dotted Smartweed is distinguished almost entirely on its darker, shinier seeds from the similar Marshpepper Smartweed (Polygonum hydropiper), which has dull brown seeds. As other species are recognized to have dimorphic seeds, the natural separation of these two species is questionable (Hitchcock et al. 1964). Douglas et al. (1999) adds that, unlike Dotted Smartweed with its usually 5-lobed perianths and interrupted racemes, Marshpepper Smartweed has mostly 4-lobed perianths, and racemes that are barely interrupted.

Species Range
Present
 


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

Summary of Observations Submitted for Montana
Number of Observations: 12

(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
Mud along margins of streams, wetlands; plains, valleys (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Reproductive Characteristics
Flowers: Flowers typically extended beyond the involucres; perianth 3-3.5 mm in length, the tepals unequal, ovate to oblong, densely glandular-punctate, joined for nearly half their length, greenish with white or pink margins; stamens 8, styles 2-3, free or attached together basally, shy of 0.5 mm in length (Hitchcock et al. 1964).

Fruit: Achene lenticular or 3-sided (Hitchcock et al. 1964), not winged, 2–3 mm long, shiny dark brown to black (Lesica 2012).

(Lesica’s contribution adapted from Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX.)

References
  • Literature Cited AboveLegend:   View Online Publication
    • Hitchcock, C. L., A. Cronquist, M. Ownbey, and J. W. Thompson. 1964. Vascular Plants of the Pacific Northwest. Part 2: Salicaceae to Saxifragaceae. University of Washington Press, Seattle. 597 pp.
    • Lesica, P., M. T. Lavin, and P. F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
    • McGregor, R.L., coordinator, and T.M. Barkley, R.E. Brooks, and E.K. Schofield, eds.: Great Plains Flora Association. 1986. Flora of the Great Plains. Lawrence, KS: Univ. Press Kansas. 1392 pp.
  • Additional ReferencesLegend:   View Online Publication
    Do you know of a citation we're missing?
    • Britton, N. L. and A. B. Brown. 1913. An Illustrated Flora of the Northern United States, Canada, and the British Possessions. 2nd Edition in 3 Volumes. New York, NY: Charles Scribner's Sons. B13BRI01PAUS.
  • Web Search Engines for Articles on "Dotted Smartweed"
  • Additional Sources of Information Related to "Dicots"
Login Logout
Citation for data on this website:
Dotted Smartweed — Polygonum punctatum.  Montana Field Guide.  .  Retrieved on , from