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Montana Field Guide

Montana Field Guides

Common Clammyweed - Polanisia dodecandra
Other Names:  Polanisia trachysperma

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Native Species

Global Rank: G5
State Rank: S4
C-value: 4


Agency Status
USFWS:
USFS:
BLM:


 

External Links

 
General Description
Glandular-hairy annual. Stems simple or branched below, 5–40 cm. Leaves petiolate, 3-foliolate; the leaflets narrowly elliptic, 1–5 cm long. Inflorescence with simple or 3-foliolate bracts. Flowers white to pink, slightly irregular; petals 5–11 mm long, clawed, the blade emarginate; sepals distinct, 2–3 mm long; stamens 12 to 27, ca. twice as long as petals. Fruit glandular-pubescent, broadly linear, 1–6 cm long, inflated, erect, short-stipitate (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Our plants are the western variety trachysperma (Torr.& A.Gray) H.H. Iltis

Species Range
Montana Range Range Descriptions

Native
 


Range Comments
OR to QC south to CA, TX, MD and Mexico (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 33

(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
Sparsely-vegetated, sandy to clayey soil of sagebrush and saltbush steppe, streambanks, roadsides; plains, valleys (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).


References
  • Literature Cited AboveLegend:   View Online Publication
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
  • Additional ReferencesLegend:   View Online Publication
    Do you know of a citation we're missing?
    • Anderson, N.L. 1951. Field studies on the biology of range grasshoppers of southeastern Montana. M.Sc. Thesis. Bozeman, Montana: Montana State University. 96 p.
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2022. Manual of Montana Vascular Plants, Second Edition. Fort Worth, TX: BRIT Press. viii + 779 p.
    • Quire, R.L. 2013. The sagebrush steppe of Montana and southeastern Idaho shows evidence of high native plant diversity, stability, and resistance to the detrimental effects of nonnative plant species. M.Sc. Thesis. Bozeman, MT: Montana State University. 124 p.
    • Seipel, T.F. 2006. Plant species diversity in the sagebrush steppe of Montana. M.Sc. Thesis. Bozeman, MT: Montana State University. 87 p.
  • Web Search Engines for Articles on "Common Clammyweed"
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Citation for data on this website:
Common Clammyweed — Polanisia dodecandra.  Montana Field Guide.  .  Retrieved on , from