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Montana Field Guides

Border Goldthread - Thelesperma subnudum
Other Names:  Thelesperma marginatum

Native Species

Global Rank: G5
State Rank: S4

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 3

External Links






 
General Description
Glabrous perennial from a branched caudex. Stems erect, simple, 10–25 cm. Leaves cauline, opposite; lower petiolate, deeply 3-lobed; lobes linear-lanceolate, 1–3 cm long; upper reduced, simple. Inflorescence of 1 to 3 terminal heads; peduncles 2–15 cm long. Heads discoid; involucre hemispheric, 6–9 mm high; phyllaries in 2 very unequal series; the inner narrowly ovate, striate, scarious-margined, united below; outer short, often reflexed; receptacle flat with a scale subtending each flower. Disk flowers perfect, yellow; corollas 4–6 mm long, tube shorter than the throat; style branches flattened. Pappus of 2 minute awns or absent. Achenes cylindric, compressed, glabrous, 5–7 mm long, enclosed in the scale (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Our plants are variety marginatum (Rydb.) Cronquist.

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

Observations in Montana Natural Heritage Program Database
Number of Observations: 1

(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, coniferous woodlands; 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, Montana: Montana State University. 39 p.
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Citation for data on this website:
Border Goldthread — Thelesperma subnudum.  Montana Field Guide.  .  Retrieved on , from