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Montana Field Guide

Montana Field Guides

Annual Ragweed - Ambrosia artemisiifolia

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Native Species

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


Agency Status
USFWS:
USFS:
BLM:


 

External Links

 
General Description
Taprooted annual. Stems erect, branched, 10–60 cm. Herbage strigose, glandular. Leaves opposite below; blade ovate, 1–8 cm long, ca. twice pinnatifid. Female heads 1-flowered. Male heads cup-shape, villous, glandular, 2–3 mm wide with 12 to 20 florets, spreading on peduncles ca. 0.5 mm long. Bur 2–3 mm long, ovoid, beaked, glandular, villous with few short spines around the middle (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Montana Range Range Descriptions

Native
 


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

Observations in Montana Natural Heritage Program Database
Number of Observations: 48

(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

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?
    • 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.
    • Meier, G.A. 1997. The colonization of Montana roadsides by native and exotic plants. M.Sc. Thesis. Bozeman, MT: Montana State University. 45 p.
  • Web Search Engines for Articles on "Annual Ragweed"
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Citation for data on this website:
Annual Ragweed — Ambrosia artemisiifolia.  Montana Field Guide.  .  Retrieved on , from