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Montana Field Guides

Rayless Tansy-aster - Xanthisma grindelioides
Other Names:  Machaeranthera grindelioides

Native Species

Global Rank: G5
State Rank: S5

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

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General Description
Stems ascending to erect, branched above, 5–20 cm. Herbage villous to sparsely tomentose, sometimes minutely glandular. Leaf blades lanceolate to oblanceolate, 1–3 cm long, spiny-dentate. Heads discoid, solitary on branch tips; involucre hemispheric, 6–9 mm high; phyllaries in 3 to 5 series, stipitate-glandular. Disk flowers 15 to 50; corollas 4–6 mm long. Achenes 2–4 mm long (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Our plants are variety grindelioides.

Species Range
Montana Range

Year-round
 


Range Comments
AB, SK south to AZ, NM and NE (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 95

(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
Stony or sandy soil of grasslands, badlands; plains, valleys (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

References
  • Additional ReferencesLegend:   View Online Publication
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    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
    • Peterson, J.G. 1969. The food habits and summer distribution of juvenile sage grouse in central Montana. M.Sc. Thesis. Bozeman, MT: Montana State University. 39 p.
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Citation for data on this website:
Rayless Tansy-aster — Xanthisma grindelioides.  Montana Field Guide.  .  Retrieved on , from