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Montana Field Guide

Montana Field Guides

White Cudweed - Gnaphalium microcephalum
Other Names:  Pseudognaphalium canescens, Pseudognaphalium thermale, Gnaphalium thermale

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Native Species

Global Rank: G5
State Rank: SNR
C-value:


Agency Status
USFWS:
USFS:
BLM:


 

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General Description
Short-lived taprooted perennial. Stems erect, often branched at the base, 20–70 cm. Leaves 3–8 cm long; basal petiolate, oblanceolate; cauline linear-oblanceolate, sessile, decurrent on the stem. Glomerules terminal in an open ovoid to pyramidal inflorescence, surpassing subtending leaves. Involucres 5–6 mm high; phyllaries white, with acute tips, sometimes tomentose at the base. Inner corollas 3–4 mm long. Achenes 0.5–1 mm long; pappus deciduous separately (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Diagnostic Characteristics
Ours is variety thermale (E.E. Nelson) Cronquist

Range Comments
BC, AB south to CA, NV, UT and WY (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 14

(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 roadsides, grasslands, meadows, open forest, locally common following timber harvest; valleys (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

References
  • Literature Cited AboveLegend:   View Online Publication
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
  • Additional ReferencesLegend:   View Online Publication
    Do you know of a citation we're missing?
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2022. Manual of Montana Vascular Plants, Second Edition. Fort Worth, TX: BRIT Press. viii + 779 p.
    • Simanonok, M. 2018. Plant-pollinator network assembly after wildfire. Ph.D. Dissertation. Bozeman, MT: Montana State University. 123 p.
    • Simanonok, M.P. and L.A. Burkle. 2019. Nesting success of wood-cavity-nesting bees declines with increasing time since wildfire. Ecology and Evolution 9:12436-12445.
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Citation for data on this website:
White Cudweed — Gnaphalium microcephalum.  Montana Field Guide.  .  Retrieved on , from