Burke: Packera streptanthifolia vs. Packera contermina

	Packera streptanthifolia	Packera contermina
	Rocky Mountain butterweed, cleftleaf groundsel, Rocky Mountain groundsel	dwarf arctic butterweed
Habit	Glabrous, fibrous-rooted perennial from a short, woody base or rhizome, 1-5 dm. high.
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 somewhat thick, the basal ones ovate to kidney-shaped, sub-entire or with blunt teeth, the blade up to 2.5 cm. long and wide, abruptly contracted to the petiole; cauline leaves reduced upwards, becoming sessile, occasionally pinnatifid.
Inflorescence		Heads solitary, or rarely 2, the disk 11-18 mm. wide, usually orange; involucre 7-8 mm. high, the bracts purplish; rays various, sometimes up to 14 mm. long and 4 mm. wide; pappus of numerous, white, capillary bristles.
Flowers	Heads several, involucres 5-7 mm. high; rays 6-12 mm. long, yellow.
Fruits		Achene sub-terete.

	Packera streptanthifolia	Packera contermina
Flowering time	May-August	July-September
Habitat	Moist to moderately dry open areas and forest, from middle elevations to the subalpine.	Exposed, rocky places in the alpine to occasionally the subalpine;
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 Washington, east to Alberta and Montana. [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. flettii, P. indecora, P. macounii, 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, 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 contermina

Rocky Mountain butterweed, cleftleaf groundsel, Rocky Mountain groundsel

dwarf arctic butterweed

Habit

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

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 somewhat thick, the basal ones ovate to kidney-shaped, sub-entire or with blunt teeth, the blade up to 2.5 cm. long and wide, abruptly contracted to the petiole;

cauline leaves reduced upwards, becoming sessile, occasionally pinnatifid.

Inflorescence

Heads solitary, or rarely 2, the disk 11-18 mm. wide, usually orange;

involucre 7-8 mm. high, the bracts purplish;

rays various, sometimes up to 14 mm. long and 4 mm. wide; pappus of numerous, white, capillary bristles.

Flowers

Heads several, involucres 5-7 mm. high;

rays 6-12 mm. long, yellow.

Fruits

Achene sub-terete.