OregonFlora: Pseudognaphalium microcephalum vs. Pseudognaphalium thermale

	Pseudognaphalium microcephalum	Pseudognaphalium thermale
		northwestern rabbit-tobacco, Wright's cudweed
Habit		Plants perennial, 2–9 dm.
Stems		floccose-tomentose, not glandular.
Leaves		1.5–9 cm, linear to oblanceolate to narrowly oblong, bases decurrent on stem, not clasping; surfaces floccose-tomentose, sometimes minutely glandular beneath longer trichomes.
Involucres		4–6 mm.
Phyllaries		in 3–4 series, white; surfaces glabrous.
Fruits		0.5–0.6 mm, brown; pappi white.
Outer florets		35–55; corolla tips yellow.
Inner florets		4–7.

	Pseudognaphalium microcephalum	Pseudognaphalium thermale
Distribution	[WildflowerSearch map]	[WildflowerSearch map]
Discussion		Conifer forests, shrublands, grasslands, riverbanks, lakesides, dry slopes, roadsides, disturbed areas. Flowering Jun–Oct. 0–2000 m. BW, Casc, CR, ECas, Sisk. CA, ID, NV, WA; north to British Columbia, northeast to Alberta, east to WY, southeast to UT. Native. Pseudognaphalium thermale is here recognized at the species rank rather than its earlier placement as a subspecies of P. canescens or a variety of P. microcephalum.
Source		Flora of Oregon, volume 2, page 327 Kenton Chambers
Sibling taxa	P. californicum, P. luteoalbum, P. macounii, P. stramineum, P. thermale	P. californicum, P. luteoalbum, P. macounii, P. stramineum
Synonyms		Gnaphalium canescens ssp. thermale, Gnaphalium microcephalum, Gnaphalium microcephalum var. thermale, Gnaphalium thermale
Web links	Local floras: BC, CA, OR, WA Local Web sites: CalFlora, CalPhotos, Flora NW, PNW Herbaria WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search	Local floras: BC, CA, OR, WA Local Web sites: CalFlora, CalPhotos, Flora NW, PNW Herbaria WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search

Pseudognaphalium microcephalum

Pseudognaphalium thermale

northwestern rabbit-tobacco, Wright's cudweed

Habit

Plants perennial, 2–9 dm.

Stems

floccose-tomentose, not glandular.

Leaves

1.5–9 cm, linear to oblanceolate to narrowly oblong, bases decurrent on stem, not clasping;

surfaces floccose-tomentose, sometimes minutely glandular beneath longer trichomes.

Involucres

4–6 mm.

Phyllaries

in 3–4 series, white;

surfaces glabrous.

Fruits

0.5–0.6 mm, brown;

pappi white.

Outer florets

35–55;

corolla tips yellow.

Inner florets

4–7.

Pseudognaphalium microcephalum

Pseudognaphalium thermale

Distribution

[WildflowerSearch map]

Discussion

Conifer forests, shrublands, grasslands, riverbanks, lakesides, dry slopes, roadsides, disturbed areas. Flowering Jun–Oct. 0–2000 m. BW, Casc, CR, ECas, Sisk. CA, ID, NV, WA; north to British Columbia, northeast to Alberta, east to WY, southeast to UT. Native.

Pseudognaphalium thermale is here recognized at the species rank rather than its earlier placement as a subspecies of P. canescens or a variety of P. microcephalum.

Source

Flora of Oregon, volume 2, page 327
Kenton Chambers

Sibling taxa

P. californicum, P. luteoalbum, P. macounii, P. stramineum, P. thermale

P. californicum, P. luteoalbum, P. macounii, P. stramineum

Synonyms

Gnaphalium canescens ssp. thermale, Gnaphalium microcephalum, Gnaphalium microcephalum var. thermale, Gnaphalium thermale

Web links