Flora of North America species comparison

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Pseudognaphalium thermale

Pseudognaphalium macounii

northwestern rabbit-tobacco, slender cudweed, slender false cudweed, small head cudweed, Wright's cudweed

gnaphale de Macoun, Macoun's cudweed, Macoun's everlasting, Macoun's rabbit-tobacco, sticky cudweed, winded cudweed, wing cudweed
Habit Perennials, (20–)30–70 cm; taprooted. Annuals or biennials (often sweetly fragrant), 40–90 cm; taprooted.
Stems

loosely tomentose, not glandular.

stipitate-glandular throughout (usually persistently lightly white-tomentose distally).
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.

blades (not crowded, internodes mostly 5+ mm) lanceolate to oblanceolate, 3–10 cm × 3–13 mm (distal linear), bases not clasping, decurrent 5–10 mm, margins flat to slightly revolute, faces weakly bicolor, abaxial tomentose, adaxial stipitate-glandular, otherwise glabrescent or glabrous.
Involucres

turbinate-campanulate, (4–)5–6 mm.

campanulo-subglobose, 4.5–5.5 mm.
Pistillate florets

35–55.

47–101(–156).
Bisexual florets

(2–)4–7.

5–12[–21].
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.

in 4–5 series, stramineous to creamy (hyaline, shiny), ovate to ovate-oblong, glabrous.
Heads

in loose to dense, corymbiform to paniculiform arrays.

in corymbiform arrays.
Cypselae

ridged, densely papillate-roughened.

not ridged, ± papillate-roughened.

Pseudognaphalium thermale

Pseudognaphalium macounii
Phenology Flowering Jun–Sep(–Oct). Flowering July–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 Dry, open habitats, pastures, open woods or edges, roadsides
Elevation (50–)300–2300(–2500) m ((200–)1000–7500(–8200) ft) 50–2600(–3000) m (200–8500(–9800) ft)
Distribution
from FNA
CA; ID; MT; NV; OR; UT; WA; WY; AB; BC
[WildflowerSearch map]
from FNA
AZ; CA; CO; CT; ID; IL; IN; MA; ME; MI; MN; MT; NH; NM; NY; OH; OR; PA; SD; TN; UT; VA; VT; WA; WI; WV; WY; AB; BC; MB; NB; NS; ON; PE; QC; SK; Mexico
[WildflowerSearch map]
[BONAP county map]
Discussion

Pseudognaphalium macounii is recognized by its stipitate-glandular, proximally glabrescent stems, bicolor and decurrent leaves, relatively large and many-flowered heads, and hyaline, shiny phyllaries. Reports of P. macounii from Texas are based on specimens of P. viscosum.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 19, p. 419. FNA vol. 19, p. 421.
Parent taxa Asteraceae > tribe Gnaphalieae > Pseudognaphalium 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
P. arizonicum, P. austrotexanum, P. beneolens, P. biolettii, P. californicum, P. canescens, P. helleri, P. jaliscense, P. leucocephalum, P. luteoalbum, P. micradenium, P. microcephalum, P. obtusifolium, P. pringlei, P. ramosissimum, P. roseum, P. saxicola, P. stramineum, P. thermale, 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 Gnaphalium macounii, Gnaphalium decurrens
Name authority (E. E. Nelson) G. L. Nesom: Sida 21: 781. (2004) (Greene) Kartesz: in J. T. Kartesz and C. A. Meacham, Synth. N. Amer. Fl., nomencl. innov. 30. (1999)
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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