Burke: Crataegus pruinosa vs. Crataegus douglasii

	Crataegus pruinosa	Crataegus douglasii
		black hawthorn, Douglas's hawthorn
Habit		Large shrubs or small trees, 1-6 m. tall, armed with stout, straight thorns 1-2 cm. long.
Leaves		Leaf blades obovate, tapered to the petiole, 3-6 cm. long and nearly as broad, weakly lobed, pubescent to glabrous on both surfaces.
Flowers		Flowers few in the leaf axils or terminal; calyx bell-shaped, the 5 lobes triangular, entire, reflexed, 1.5-2.5 mm. long; petals 5, white, orbicular, 5-7 mm. long; stamens 10, styles 5.
Fruits		Berry blackish, glabrous, about 1 cm. long.

	Crataegus pruinosa	Crataegus douglasii
Flowering time		May-June
Habitat		Thickets, open forests, forest edges, and riparian zones, from lowlands to middle elevations.
Distribution	[WildflowerSearch map] [BONAP county map]	Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to Saskatchewan, Idaho and Montana, also in the Great Lakes region. [WildflowerSearch map] [BONAP county map]
Origin		Native
Conservation status		Not of concern
Sibling taxa	C. castlegarensis, C. chrysocarpa, C. ×cogswellii, C. douglasii, C. gaylussacia, C. laevigata, C. macracantha, C. monogyna, C. okanaganensis, C. okennonii, C. phaenopyrum, C. phippsii, C. tenuior	C. castlegarensis, C. chrysocarpa, C. ×cogswellii, C. gaylussacia, C. laevigata, C. macracantha, C. monogyna, C. okanaganensis, C. okennonii, C. phaenopyrum, C. phippsii, C. tenuior
Web links	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	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

Crataegus pruinosa

Crataegus douglasii

black hawthorn, Douglas's hawthorn

Habit

Large shrubs or small trees, 1-6 m. tall, armed with stout, straight thorns 1-2 cm. long.

Leaves

Leaf blades obovate, tapered to the petiole, 3-6 cm. long and nearly as broad, weakly lobed, pubescent to glabrous on both surfaces.

Flowers

Flowers few in the leaf axils or terminal;

calyx bell-shaped, the 5 lobes triangular, entire, reflexed, 1.5-2.5 mm. long;

petals 5, white, orbicular, 5-7 mm. long;

stamens 10, styles 5.

Fruits

Berry blackish, glabrous, about 1 cm. long.

Crataegus pruinosa

Crataegus douglasii

Flowering time

May-June

Habitat

Thickets, open forests, forest edges, and riparian zones, from lowlands to middle elevations.

Distribution

[WildflowerSearch map]

[BONAP county map]

Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to Saskatchewan, Idaho and Montana, also in the Great Lakes region.

[WildflowerSearch map]

[BONAP county map]

Origin

Native

Conservation status

Not of concern

Sibling taxa