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Montana Field Guide

Montana Field Guides

Wavyleaf Thistle - Cirsium undulatum


Global Rank: G5
State Rank: S5

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

External Links






 
General Description
Taprooted biennial. Stems erect, often branched, 20–100 cm. Herbage arachnoid-tomentose throughout; stems and leaf undersides densely white-tomentose. Leaves petiolate; blade lanceolate to obovate, 5–20 cm long, undulate, deeply pinnately lobed to subentire. Inflorescence: heads mostly solitary at stem tips, forming open corymbiform arrays; peduncles 1–10 cm long. Involucres ovoid to hemispheric, 25–35 mm high; phyllaries imbricate in 8 to 12 series, green; outer lanceolate, sparsely arachnoid mainly on the margins with a darkened, resinous keel and spreading spine-tip 3–5 mm long; inner linear-lanceolate, acuminate. Disk corollas pink to purple, 25–40 mm long. Achenes 6–7 mm long (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Present
 


Range Comments
BC to MB south to CA, AZ, TX, MO and Mexico (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Summary of Observations Submitted for Montana
Number of Observations: 42

(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
Grasslands, sagebrush steppe, roadsides; plains, valleys, lower montane (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX)

References
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Citation for data on this website:
Wavyleaf Thistle — Cirsium undulatum.  Montana Field Guide.  .  Retrieved on , from