Flora of North America species comparison

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Pseudognaphalium thermale

Pseudognaphalium jaliscense

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

Jalisco rabbit-tobacco
Habit Perennials, (20–)30–70 cm; taprooted. Annuals or biennials, 30–70 cm; taprooted.
Stems

loosely tomentose, not glandular.

(branched among heads) densely and persistently loosely woolly-tomentose-sericeous, 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.

blades narrowly lanceolate to nearly linear, 3–10 cm × 3–6 mm, bases not clasping, decurrent 4–8 mm, margins flat or slightly revolute, faces concolor, tomentose-sericeous (bases of hairs enlarged), sessile-glandular beneath tomentum.
Involucres

turbinate-campanulate, (4–)5–6 mm.

campanulate, 5–6 mm.
Pistillate florets

35–55.

(80–)115[–180].
Bisexual florets

(2–)4–7.

(6–)8–12[–30].
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 5–6(–7) series, white (opaque, dull), ovate or elliptic (keeled, apiculate), glabrous.
Heads

in loose to dense, corymbiform to paniculiform arrays.

in corymbiform arrays.
Cypselae

ridged, densely papillate-roughened.

weakly ridged, papillate-roughened or smooth.

Pseudognaphalium thermale

Pseudognaphalium jaliscense
Phenology Flowering Jun–Sep(–Oct). Flowering Jul–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 Grasslands, chaparral, openings in oak-pine-juniper, oak, and ponderosa pine woodlands, roadsides, disturbed sites
Elevation (50–)300–2300(–2500) m ((200–)1000–7500(–8200) ft) 1500–2300 m (4900–7500 ft)
Distribution
from FNA
CA; ID; MT; NV; OR; UT; WA; WY; AB; BC
[WildflowerSearch map]
from FNA
AZ; CO; NE; NM; TX; Mexico
[BONAP county map]
Discussion

Pseudognaphalium jaliscense is recognized by its relatively long, narrow, concolor to weakly bicolor leaves with non-clasping, short-decurrent bases, relatively large heads with white, opaque, dull phyllaries, and relatively large numbers of pistillate and bisexual florets. Counts of pistillate and bisexual florets from the United States collections are mostly 90–115 and (6–)8–12 (fewer than in Mexico).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 19, p. 419. FNA vol. 19, p. 424.
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. leucocephalum, P. luteoalbum, P. macounii, 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 jaliscense
Name authority (E. E. Nelson) G. L. Nesom: Sida 21: 781. (2004) (Greenman) Anderberg: Opera Bot. 104: 147. (1991)
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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