Burke: Pseudognaphalium luteoalbum vs. Pseudognaphalium microcephalum

	Pseudognaphalium luteoalbum	Pseudognaphalium microcephalum
	weedy cudweed, red-tip rabbit-tobacco, jersey rabbit tobacco
Habit	Woolly annual, simple or moderately branched, up to 4 dm. tall.	Herbaceous perennials, the stems 30-70 cm. tall, loosely white-woolly, not glandular.
Leaves	Lowermost leaves oblanceolate, up to 4.5 cm. long and 1 cm. wide, the others progressively reduced upward.	Leaves alternate, oblanceolate to linear, 3-8 cm. long and 3-6 mm. wide, with a wing down the stem below each leaf 4-15 mm. long, the blades loosely white-woolly and with sessile glands.
Flowers	Heads in several tight clusters, in a close inflorescence; involucre 3.5-5 mm. high, woolly only at the base, its bracts translucent, light brown; corollas all tubular, whitish, the outer slender and pistillate, the few inner coarser and perfect; pappus of capillary bristles united at base.	Heads in loose to dense, flat-topped inflorescences; involucres broadly top-shaped, 5-6 mm. long; involucral bracts in 3-4 series, usually shiny and whitish, glabrous, ovate to oblong; corollas all tubular, the outer pistillate, 35-55, the inner perfect, 4-7; pappus of capillary bristles.
Fruits	Achenes small, nerveless.	Achenes rigid, roughened.

	Pseudognaphalium luteoalbum	Pseudognaphalium microcephalum
Flowering time	June-October	June-September
Habitat	Roadsides, fields, wastelots, and other disturbed areas at low elevations.	Dry, sandy banks and ditches, open woods of ponderosa pine and Douglas fir, and mixed deciduous forests.
Distribution	Occurring in scattered locations on both sides of the Cascades crest in Washington; Washington to California, east across the southern U.S. to Florida, also in New York. [WildflowerSearch map]	Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to Montana and Utah. [WildflowerSearch map]
Origin	Introduced from Eurasia	Native
Conservation status	Not of concern	Not of concern
Sibling taxa	P. californicum, P. macounii, P. stramineum, P. thermale	P. californicum, P. luteoalbum, P. macounii, P. stramineum, P. 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: CA, OR 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 luteoalbum

Pseudognaphalium microcephalum

weedy cudweed, red-tip rabbit-tobacco, jersey rabbit tobacco

Habit

Woolly annual, simple or moderately branched, up to 4 dm. tall.

Herbaceous perennials, the stems 30-70 cm. tall, loosely white-woolly, not glandular.

Leaves

Lowermost leaves oblanceolate, up to 4.5 cm. long and 1 cm. wide, the others progressively reduced upward.

Leaves alternate, oblanceolate to linear, 3-8 cm. long and 3-6 mm. wide, with a wing down the stem below each leaf 4-15 mm. long, the blades loosely white-woolly and with sessile glands.

Flowers

Heads in several tight clusters, in a close inflorescence;

involucre 3.5-5 mm. high, woolly only at the base, its bracts translucent, light brown;

corollas all tubular, whitish, the outer slender and pistillate, the few inner coarser and perfect;

pappus of capillary bristles united at base.

Heads in loose to dense, flat-topped inflorescences;

involucres broadly top-shaped, 5-6 mm. long;

involucral bracts in 3-4 series, usually shiny and whitish, glabrous, ovate to oblong;

corollas all tubular, the outer pistillate, 35-55, the inner perfect, 4-7;

pappus of capillary bristles.

Fruits

Achenes small, nerveless.

Achenes rigid, roughened.

Pseudognaphalium luteoalbum

Pseudognaphalium microcephalum

Flowering time

June-October

June-September

Habitat

Roadsides, fields, wastelots, and other disturbed areas at low elevations.

Dry, sandy banks and ditches, open woods of ponderosa pine and Douglas fir, and mixed deciduous forests.

Distribution

Occurring in scattered locations on both sides of the Cascades crest in Washington; Washington to California, east across the southern U.S. to Florida, also in New York.

[WildflowerSearch map]