Crataegus douglasii

Crataegus douglasii
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Rosids
Order:	Rosales
Family:	Rosaceae
Genus:	Crataegus
Species:	C. douglasii
Binomial name
	Crataegus douglasii; Lindl.
	Natural range of Crataegus douglasii
Synonyms
	C. brockwayae Sarg.; C. columbiana Howell

Crataegus douglasii is a North American species of hawthorn known by the common names black hawthorn and Douglas' thornapple. It is named after David Douglas, who collected seed from the plant during his botanical explorations.^[3]

This thorny shrub is native to northern and western North America, where it grows in varied habitats from forest to scrubland. It is most abundant in the Pacific Northwest.

Description[]

Crataegus douglasii is a compact erect bushy shrub covered in fan-shaped green leaves with teeth along the distal margin. Thorns along the branches are one to two centimeters long.

White flowers with greenish centers grow in bunches at the ends of each thin branch. The fruit is a very dark purple pome up to about a centimeter across. The fruits were a good food source for Native American peoples such as the Cheyenne and Nlaka'pamux.

Ecology[]

The foliage is browsed by cattle and sheep, and various birds, including quail, the Hungarian partridge, and ring-necked pheasant, feed on the berries.^[3]^[4] It is a larval host to the gray hairstreak, mourning cloak, pale tiger swallowtail, and western tiger swallowtail.^[5]

Formerly placed within this species[]

Crataegus douglasii var. duchesnensis is now considered to be a synonym of Crataegus saligna.

Images[]

Straight, stout thorns are one to two centimeters long.^[6]
The white flowers have greenish centers.
Crataegus douglasii
The leaf margin is toothed and usually slightly lobed.
Crataegus douglasii leaves changing color in fall.
The mature bark is grey and rough.^[7]
Crataegus douglasii
Crataegus douglasii JEPS109866 (4496863581)

References[]

USDA Forest Service: Fire Effects Information System

^ Kruschke, E.P. (1965). "Contributions to the taxonomy of Crataegus". Milwaukee Public Museum Publications in Botany. 3: 11–273.
^ Phipps, J.B. (1995). "The identity of Crataegus columbiana and its relationship to C. piperi (Rosaceae)". Taxon. 44 (3): 405–8. doi:10.2307/1223414. JSTOR 1223414.
^ Jump up to: ^a ^b Whitney, Stephen (1985). Western Forests (The Audubon Society Nature Guides). New York: Knopf. p. 392. ISBN 0-394-73127-1.
^ Peattie, Donald Culross (1953). A Natural History of Western Trees. New York: Bonanza Books. p. 519.
^ The Xerces Society (2016), Gardening for Butterflies: How You Can Attract and Protect Beautiful, Beneficial Insects, Timber Press.
^ "Crataegus douglasii". WTU Herbarium Image Collection. Burke Museum, University of Washington. Retrieved 2009-12-12.
^ Pojar, Jim; Andy MacKinnon (1994). Plants of the Pacific Northwest. Lone Pine. p. 73. ISBN 1-55105-042-0.

External links[]

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[1] Kruschke, E.P. (1965). "Contributions to the taxonomy of Crataegus". Milwaukee Public Museum Publications in Botany. 3: 11–273.

[2] Phipps, J.B. (1995). "The identity of Crataegus columbiana and its relationship to C. piperi (Rosaceae)". Taxon. 44 (3): 405–8. doi:10.2307/1223414. JSTOR 1223414.

[Knopf-3] Jump up to: ^a ^b Whitney, Stephen (1985). Western Forests (The Audubon Society Nature Guides). New York: Knopf. p. 392. ISBN 0-394-73127-1.

[4] Peattie, Donald Culross (1953). A Natural History of Western Trees. New York: Bonanza Books. p. 519.

[5] The Xerces Society (2016), Gardening for Butterflies: How You Can Attract and Protect Beautiful, Beneficial Insects, Timber Press.

[Burke-6] "Crataegus douglasii". WTU Herbarium Image Collection. Burke Museum, University of Washington. Retrieved 2009-12-12.

[Pojar-7] Pojar, Jim; Andy MacKinnon (1994). Plants of the Pacific Northwest. Lone Pine. p. 73. ISBN 1-55105-042-0.

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