Burke: Packera streptanthifolia vs. Packera subnuda

	Packera streptanthifolia	Packera subnuda
	Rocky Mountain butterweed, cleftleaf groundsel, Rocky Mountain groundsel	alpine meadow butterweed, few-leaved groundsel
Habit	Glabrous, fibrous-rooted perennial from a short, woody base or rhizome, 1-5 dm. high.	Glabrous, fibrous-rooted perennial from a short, slender rhizome, 5-30 cm. tall.
Leaves	Somewhat succulent, the basal ones with long petioles and mostly elliptic or sub-rotund blade, with course, rounded teeth or entire; cauline leaves few and reduced, becoming sessile on the upper stem but not clasping, about twice as long as wide, usually somewhat coarsely lobed toward their bases.	Leaves alternate, small, the basal ones sub-rotund or broadly obovate with wavy margins, on long petioles, the blades up to 2.5 cm. long and 2 cm. wide; cauline leaves few and reduced, the stem sometimes naked.
Flowers	Heads several, involucres 5-7 mm. high; rays 6-12 mm. long, yellow.	Heads usually solitary, the disk 8-15 mm. wide; involucre 5-8 mm. high, the bracts sometimes purplish-tipped; rays 7-14 mm. long, yellow.
Fruits		Achene

	Packera streptanthifolia	Packera subnuda
Identification notes		A Packera with a large, single head growing in a wet alpine meadow is probably this species.
Flowering time	May-August	July-September.
Habitat	Moist to moderately dry open areas and forest, from middle elevations to the subalpine.	Wet meadows in the subalpine and alpine.
Distribution	Occurring on both sides of the Cascades crest in Washington; Yukon Territory to California, east to the Rocky Mountains and Sasketchewan. [WildflowerSearch map] [BONAP county map]	Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to Alberta, Montana, and Wyoming. [WildflowerSearch map] [BONAP county map]
Origin	Native	Native
Conservation status	Not of concern	Not of concern
Sibling taxa	P. bolanderi, P. cana, P. contermina, P. flettii, P. indecora, P. macounii, P. pauciflora, P. paupercula, P. porteri, P. pseudaurea, P. subnuda	P. bolanderi, P. cana, P. contermina, P. flettii, P. indecora, P. macounii, P. pauciflora, P. paupercula, P. porteri, P. pseudaurea, P. streptanthifolia
Subordinate taxa		P. subnuda var. subnuda
Web links	Local floras: BC, OR, WA Local Web sites: Flora NW, PNW Herbaria, Turner Photog. 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, OR, WA Local Web sites: 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

Packera streptanthifolia

Packera subnuda

Rocky Mountain butterweed, cleftleaf groundsel, Rocky Mountain groundsel

alpine meadow butterweed, few-leaved groundsel

Habit

Glabrous, fibrous-rooted perennial from a short, woody base or rhizome, 1-5 dm. high.

Glabrous, fibrous-rooted perennial from a short, slender rhizome, 5-30 cm. tall.

Leaves

Somewhat succulent, the basal ones with long petioles and mostly elliptic or sub-rotund blade, with course, rounded teeth or entire;

cauline leaves few and reduced, becoming sessile on the upper stem but not clasping, about twice as long as wide, usually somewhat coarsely lobed toward their bases.

Leaves alternate, small, the basal ones sub-rotund or broadly obovate with wavy margins, on long petioles, the blades up to 2.5 cm. long and 2 cm. wide;

cauline leaves few and reduced, the stem sometimes naked.

Flowers

Heads several, involucres 5-7 mm. high;

rays 6-12 mm. long, yellow.

Heads usually solitary, the disk 8-15 mm. wide;

involucre 5-8 mm. high, the bracts sometimes purplish-tipped;

rays 7-14 mm. long, yellow.

Fruits

Achene