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Montana Field Guide

Montana Field Guides

Annual Ragweed - Ambrosia artemisiifolia


Global Rank: G5
State Rank: S4?

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

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 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Present
 


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

Summary of Observations Submitted for Montana
Number of Observations: 7

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Relative Density

Recency

 

(Observations spanning multiple months or years are excluded from time charts)



Habitat

References
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Citation for data on this website:
Annual Ragweed — Ambrosia artemisiifolia.  Montana Field Guide.  .  Retrieved on , from