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Montana Field Guide

Montana Field Guides

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

Native Species

Global Rank: G5
State Rank: SNR

Agency Status
MNPS Threat Rank:

External Links

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 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 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 17

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density



(Observations spanning multiple months or years are excluded from time charts)

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

  • Additional ReferencesLegend:   View Online Publication
    Do you know of a citation we're missing?
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
    • Simanonok, M. 2018. Plant-pollinator network assembly after wildfire. Ph.D. Dissertation. Bozeman, MT: Montana State University. 123 p.
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Citation for data on this website:
White Cudweed — Gnaphalium microcephalum.  Montana Field Guide.  .  Retrieved on , from