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Montana Field Guide

Montana Field Guides

Common Sunflower - Helianthus annuus


Global Rank: G5
State Rank: S5

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 2

External Links






 
General Description
Common sunflower Taprooted annual. Stems erect, often branched, 25–100 cm. Herbage scabrous to sparsely hispid. Leaves alternate; blades weakly to strongly serrate, lanceolate to ovate, sometimes cordate, 5–20 cm long. Involucres 15–35 mm across; phyllaries ovate, long-acuminate, hispid, long-ciliate, 12–25 mm long. Ray ligules 16–45 mm long. Disk corollas 5–8 mm long, lobes often deep red. Achenes 4–5 mm long (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Present
 


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

Summary of Observations Submitted for Montana
Number of Observations: 74

(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
Disturbed soil of fields, grasslands, streambanks, roadsides; 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:
Common Sunflower — Helianthus annuus.  Montana Field Guide.  .  Retrieved on , from