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Montana Field Guide

Montana Field Guides

Stiff Sunflower - Helianthus pauciflorus
Other Names:  Helianthus rigidus, Helianthus laetiflorus

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Global Rank: G5
State Rank: S4

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

External Links

 
General Description
Rhizomatous perennial. Stems erect, usually simple, 30–100 cm. Herbage scabrous to hispid-strigose. Leaves opposite at least below; blades serrate, lanceolate to ovate, 3–12 cm long. Involucres 14–23 mm across; phyllaries broadly lanceolate to ovate, glabrate, minutely ciliate, 6–10 mm long. Ray ligules 10–30 mm long. Disk corollas 4–8 mm long. Achenes 4–6 mm long (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Our plants are subspecies subrhomboideus (Rydb.) O. Spring & E.E. Schill.

Species Range
Present
 


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

Summary of Observations Submitted for Montana
Number of Observations: 20

(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
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Citation for data on this website:
Stiff Sunflower — Helianthus pauciflorus.  Montana Field Guide.  .  Retrieved on , from