Burke: Packera streptanthifolia vs. Packera macounii

	Packera streptanthifolia	Packera macounii
	Rocky Mountain butterweed, cleftleaf groundsel, Rocky Mountain groundsel	Puget butterweed, long-rayed groundsel, Macoun's groundsel, Siskiyou Mountain ragwort
Habit	Glabrous, fibrous-rooted perennial from a short, woody base or rhizome, 1-5 dm. high.	Several-stemmed, robust perennial from a taproot, 2-7 dm. tall, thinly white-woolly throughout.
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.	Basal leaves more or less tufted, narrowly oblanceolate, the blade 1-5 cm. long and 3-7 mm. wide, entire to sub-pinnately lobed, petiolate; other leaves few, stongly reduced upward, becoming bract-like.
Flowers	Heads several, involucres 5-7 mm. high; rays 6-12 mm. long, yellow.	Heads several in an open, somewhat flat-topped inflorescence; involucre 6-10 mm. high; rays 6-13 mm. long, yellow.
Fruits		Achene

	Packera streptanthifolia	Packera macounii
Flowering time	May-August	May-July
Habitat	Moist to moderately dry open areas and forest, from middle elevations to the subalpine.	Open woods and dry, open places at low elevations.
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 west of the Cascades crest in Washington; British Columbia to California. [WildflowerSearch map] [BONAP county map]
Origin	Native	Native
Conservation status	Not of concern	Threatened in Washington (WANHP)
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. pauciflora, P. paupercula, P. porteri, P. pseudaurea, P. streptanthifolia, P. 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, CA, OR, WA Local Web sites: CalFlora, CalPhotos, 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

Packera macounii

Rocky Mountain butterweed, cleftleaf groundsel, Rocky Mountain groundsel

Puget butterweed, long-rayed groundsel, Macoun's groundsel, Siskiyou Mountain ragwort

Habit

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

Several-stemmed, robust perennial from a taproot, 2-7 dm. tall, thinly white-woolly throughout.

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.

Basal leaves more or less tufted, narrowly oblanceolate, the blade 1-5 cm. long and 3-7 mm. wide, entire to sub-pinnately lobed, petiolate; other leaves few, stongly reduced upward, becoming bract-like.

Flowers

Heads several, involucres 5-7 mm. high;

rays 6-12 mm. long, yellow.

Heads several in an open, somewhat flat-topped inflorescence;

involucre 6-10 mm. high;

rays 6-13 mm. long, yellow.

Fruits

Achene