Flora of North America species comparison

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Pseudognaphalium microcephalum

Pseudognaphalium thermale

felt-leaf everlasting, San Diego rabbit-tobacco, Wright's cudweed

northwestern rabbit-tobacco, slender cudweed, slender false cudweed, small head cudweed, Wright's cudweed
Habit Perennials, (30–)50–100 cm; taprooted. Perennials, (20–)30–70 cm; taprooted.
Stems

persistently grayish tomentose, not glandular, (3–5 mm diam. near bases).

loosely tomentose, not glandular.
Leaf

blades narrowly oblanceolate, 2–5(–8) cm × 5–10(–18) mm (gradually smaller distally, becoming lanceolate), bases not clasping, not decurrent, margins flat, faces weakly bicolor, tomentose (adaxial less densely), not glandular.

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, 5–6 mm.

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

29–49.

35–55.
Bisexual florets

5–9.

(2–)4–7.
Phyllaries

in 4–5 series, white (opaque, dull), ovate to oblong-ovate (inner narrower, all usually with filiform but definitely thickened keel and slight apiculum), tomentose (at least bases).

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, corymbiform arrays.

in loose to dense, corymbiform to paniculiform arrays.
Cypselae

ridged, smooth to weakly papillate-roughened.

ridged, densely papillate-roughened.
2n

= 28.

Pseudognaphalium microcephalum

Pseudognaphalium thermale
Phenology Flowering (Apr–)Jun–Aug(–Nov). Flowering Jun–Sep(–Oct).
Habitat Grassy hillsides, gravelly canyon bottoms, chaparral, coastal sage scrub 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 50–900(–1800) m (200–3000(–5900) ft) (50–)300–2300(–2500) m ((200–)1000–7500(–8200) ft)
Distribution
from FNA
CA; Mexico (Baja California)
[WildflowerSearch map]
from FNA
CA; ID; MT; NV; OR; UT; WA; WY; AB; BC
[WildflowerSearch map]
Discussion

Pseudognaphalium microcephalum is characterized by stems commonly stiffly erect and slightly zigzag distally, relatively thick (3–5 mm diam. near bases), and closely grayish tomentose, leaves oblanceolate, sessile, sometimes clasping, not decurrent, and weakly bicolor, and heads usually in open, corymbiform arrays.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 19, p. 419. FNA vol. 19, p. 419.
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. obtusifolium, P. pringlei, P. ramosissimum, P. roseum, P. saxicola, P. stramineum, P. thermale, P. viscosum
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 microcephalum, Gnaphalium albidum, Gnaphalium canescens subsp. microcephalum, P. canescens subsp. microcephalum 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 (Nuttall) Anderberg: Opera Bot. 104: 147. (1991) (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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