Flora of North America species comparison

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Pseudognaphalium thermale

northwestern rabbit-tobacco, slender cudweed, slender false cudweed, small head cudweed, Wright's cudweed
Habit Perennials, (20–)30–70 cm; taprooted.
Stems

loosely tomentose, not glandular.
Leaf

blades narrowly oblanceolate, 3–8 cm × 3–6 mm (gradually smaller distally, becoming linear), bases not clasping, decurrent 5–14 mm, margins flat, faces concolor, loosely tomentose, sessile-glandular beneath tomentum.
Involucres

turbinate-campanulate, (4–)5–6 mm.
Pistillate florets

35–55.
Bisexual florets

(2–)4–7.
Phyllaries

in 3–4(–5) series, whitish (hyaline or opaque, usually shiny, sometimes dull), ovate to ovate-oblong (outer broadly acute, inner rounded-apiculate), glabrous.
Heads

in loose to dense, corymbiform to paniculiform arrays.
Cypselae

ridged, densely papillate-roughened.

Pseudognaphalium thermale
Phenology Flowering Jun–Sep(–Oct).
Habitat Dry, sandy road banks, roadside ditches, streambeds and banks, lakeshores, granitic sand, open woods of yellow pine, Jeffrey pine, red fir, Douglas fir, mixed conifer, and mixed evergreen
Elevation (50–)300–2300(–2500) m ((200–)1000–7500(–8200) ft)
Distribution
from FNA
CA; ID; MT; NV; OR; UT; WA; WY; AB; BC
[WildflowerSearch map]
Source FNA vol. 19, p. 419.
Parent taxa Asteraceae > tribe Gnaphalieae > Pseudognaphalium
Sibling taxa
P. arizonicum, P. austrotexanum, P. beneolens, P. biolettii, P. californicum, P. canescens, P. helleri, P. jaliscense, P. leucocephalum, P. luteoalbum, P. macounii, P. micradenium, P. microcephalum, P. obtusifolium, P. pringlei, P. ramosissimum, P. roseum, P. saxicola, P. stramineum, P. viscosum
Synonyms Gnaphalium thermale, Gnaphalium canescens subsp. thermale, Gnaphalium johnstonii, Gnaphalium microcephalum var. thermale, Gnaphalium microcephalum subsp. thermale, P. canescens subsp. thermale, P. microcephalum var. thermale
Name authority (E. E. Nelson) G. L. Nesom: Sida 21: 781. (2004)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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(If the plant you're looking for doesn't show up in the auto-complete list, that means it either isn't described in Flora of North America yet, or it's listed under a synonym. And please note that Flora of North America is still missing several plant families, including Fabaceae, Apiaceae, Boraginaceae, and Polemoniaceae.)

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