Burke: Sorbus aucuparia vs. Sorbus scopulina

	Sorbus aucuparia	Sorbus scopulina
	European mountain-ash	Greene's mountain ash, Cascade mountain-ash, western mountain-ash
Habit	Small, deciduous, gray-barked tree with spreading branches, 5-12 m. tall, the young growth with soft, gray hairs.	Erect, deciduous, several-stemmed shrub 1-4 m. tall, the young growth grayish soft-hairy, the older bark yellow to grayish-red.
Leaves	Leaves pinnate; leaflets 11-15, oblong-lanceolate, pointed, 3-6 cm. long, finely and sharply serrate the full length.	Leaves pinnate; leaflets 9-13, narrowly oblong to oblong-lanceolate, 3-7 cm. long, tapered to the base and pointed at the tip, finely and sharply serrate almost the full length, glabrous, dark green and shiny above and much paler below.
Flowers	Inflorescence a large, flat-topped panicle, with at least 75 flowers; calyx obconic, hairy, the 5 lobes triangular, persistent; petals 5, white, nearly orbicular, 4 mm. long; stamens 15-20, equaling the petals; carpels 3-4, the styles 2-3 mm. long.	Inflorescence a large, pubescent, flat-topped panicle, with at least 70 flowers; calyx obconic, whitish-pubescent, the 5 lobes triangular; petals 5, white, oval, 5-6 mm. long; stamens 15-20; carpels 3-4, the styles 2 mm. long.
Fruits	Fruit globose, fleshy, bright red, pendulous, 10 mm. broad.	Fruit sub-globose, fleshy, orange to scarlet, glossy, about 1 cm. broad.

	Sorbus aucuparia	Sorbus scopulina
Flowering time	May-June	May-August
Habitat	Forest edge, thickets, shorelines, and other generally moist areas where often disturbed.	Open areas, from middle elevations to the subalpine.
Distribution	Occurring chiefly west of the Cascades crest in Washington; Alaska to Oregon, east to the Atlantic Coast. [WildflowerSearch map] [BONAP county map]	Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains and northern Great Plains. [WildflowerSearch map] [BONAP county map]
Origin	Introduced from Europe	Native
Conservation status	Not of concern	Not of concern
Sibling taxa	S. hybrida, S. scopulina, S. sitchensis	S. aucuparia, S. hybrida, S. sitchensis
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, Turner Photog. WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search

Sorbus scopulina

European mountain-ash

Greene's mountain ash, Cascade mountain-ash, western mountain-ash

Habit

Small, deciduous, gray-barked tree with spreading branches, 5-12 m. tall, the young growth with soft, gray hairs.

Erect, deciduous, several-stemmed shrub 1-4 m. tall, the young growth grayish soft-hairy, the older bark yellow to grayish-red.

Leaves

Leaves pinnate;

leaflets 11-15, oblong-lanceolate, pointed, 3-6 cm. long, finely and sharply serrate the full length.

Leaves pinnate;

leaflets 9-13, narrowly oblong to oblong-lanceolate, 3-7 cm. long, tapered to the base and pointed at the tip, finely and sharply serrate almost the full length, glabrous, dark green and shiny above and much paler below.

Flowers

Inflorescence a large, flat-topped panicle, with at least 75 flowers;

calyx obconic, hairy, the 5 lobes triangular, persistent;

petals 5, white, nearly orbicular, 4 mm. long;

stamens 15-20, equaling the petals;

carpels 3-4, the styles 2-3 mm. long.

Inflorescence a large, pubescent, flat-topped panicle, with at least 70 flowers;

calyx obconic, whitish-pubescent, the 5 lobes triangular;

petals 5, white, oval, 5-6 mm. long;

stamens 15-20;

carpels 3-4, the styles 2 mm. long.

Fruits