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

cotton-batting cudweed, cotton-batting false cudweed, cotton-batting-plant

Habit Perennials, (20–)30–70 cm; taprooted. Annuals or biennials, 30–60(–80) cm; taprooted.
Stems

loosely tomentose, not glandular.

(1+ from base, erect to ascending) 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.

blades (crowded, internodes usually 1–5, sometimes to 10 mm) oblong to narrowly oblanceolate or subspatulate, 2–8(–9.5) cm × 2–5(–10) mm (smaller distally, narrowly lanceolate to linear), bases subclasping, usually not decurrent, sometimes decurrent 1–2 mm, margins flat or slightly revolute, faces concolor, loosely and persistently gray-tomentose, not glandular.

Involucres

turbinate-campanulate, (4–)5–6 mm.

subglobose, 4–6 mm.

Pistillate florets

35–55.

160–200.

Bisexual florets

(2–)4–7.

[8–]18–28.

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, whitish (often yellowish with age, hyaline, shiny), ovate to oblong-obovate, glabrous.

Heads

in loose to dense, corymbiform to paniculiform arrays.

in terminal glomerules (1–2 cm diam.).

Cypselae

ridged, densely papillate-roughened.

weakly, if at all, ridged (otherwise smooth or papillate-roughened, glabrous, without papilliform hairs; pappus bristles loosely coherent basally, released in clusters or easily fragmented rings).

2n

= 28.

Pseudognaphalium thermale

Pseudognaphalium stramineum

Phenology Flowering Jun–Sep(–Oct). Flowering Mar–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 Sandy fields, streamsides, washes, swales, dunes, chaparral slopes, roadsides, fields, disturbed places, moist disturbed places
Elevation (50–)300–2300(–2500) m ((200–)1000–7500(–8200) ft) 10–1600 m (0–5200 ft)
Distribution
from FNA
CA; ID; MT; NV; OR; UT; WA; WY; AB; BC
[WildflowerSearch map]
from FNA
AZ; CA; CO; ID; MT; NC; NE; NM; NV; NY; OK; OR; SC; TX; UT; VA; WA; WY; BC; Mexico; South America
[WildflowerSearch map]
[BONAP county map]
Discussion

Pseudognaphalium stramineum is probably native from South America to western North America; it is adventive in sandy fields on the Atlantic coastal plain, where it flowers May–Aug.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 19, p. 419. FNA vol. 19, p. 418.
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. macounii, P. micradenium, P. microcephalum, P. obtusifolium, P. pringlei, P. ramosissimum, P. roseum, P. saxicola, 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 stramineum, Gnaphalium chilense, Gnaphalium chilense var. confertifolium, Gnaphalium gossypinum, Gnaphalium lagopodioides, Gnaphalium proximum, Gnaphalium sulphurescens
Name authority (E. E. Nelson) G. L. Nesom: Sida 21: 781. (2004) (Kunth) Anderberg: Opera Bot. 104: 148. (1991)
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