E-Flora BC: Electronic Atlas of the Flora of British Columbia

Pseudognaphalium thermale (E. E. Nelson) G. L. Nesom
slender cudweed
Asteraceae (Aster family)

Introduction to Vascular Plants

© Jim Riley  Email the photographer   (Photo ID #643)

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Distribution of Pseudognaphalium thermale
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Species Information

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Short-lived perennial herb from a woody taproot; stems several, loosely woolly, 20-70 cm tall.
Basal and lower stem leaves, alternate, entire, more or less woolly-hairy, numerous, broadly linear, 3-10 cm long, 2-10 mm wide, narrowly extending down the stem; middle and upper stem leaves similar, slightly reduced upward.
Heads disciform, numerous, in tight clusters, not conspicuously leafy, in a broad, round-topped inflorescence; involucres 4-7 mm tall; involucral bracts white to tan, woolly-hairy at the base.
Achenes nerveless, glabrous; pappus bristles distinct, falling separately.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Dry open slopes, forest openings and recently burned forests in the lowland, steppe and montane zones; common in S BC; S to ID, MT, CO and CA.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Pseudognaphalium thermale

The table below shows the species-specific information calculated from
original data (BEC database) provided by the BC Ministry of Forests and Range.
(Updated August, 2013)

Site Information
Value / Class




Elevation (metres) 25 297 634
Slope Gradient (%) 0 18 70
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
45 173 315
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
3 4 5
Modal Nutrient Regime
Number of field plots
 species was recorded in:
Modal BEC Zone Class
All BEC Zones (# of stations/zone) species was recorded in: CDF(1), CWH(41)


The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is cool temperate & cool mesothermal.

Synonyms and Alternate Names

Gnaphalium microcephalum Nutt.

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References