| 词条 | Crataegus douglasii | |||||||||
| 释义 |
|name = Crataegus douglasii |image = Crataegus douglasii.jpg |regnum = Plantae |unranked_divisio = Angiosperms |unranked_classis = Eudicots |unranked_ordo = Rosids |ordo = Rosales |familia = Rosaceae |genus = Crataegus | sectio = Douglasia |series = Douglasianae |series_authority = (Loudon) Eggl. ex Rehder[1][2] |species = C. douglasii |binomial = Crataegus douglasii |binomial_authority = Lindl. |synonyms = C. brockwayae Sarg.[3] C. columbiana Howell[4] |range_map = Crataegus douglasii range map 2.png |range_map_caption = Natural range of Crataegus douglasii |}} 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. 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. DescriptionCrataegus 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. Formerly placed within this species
ImagesSee also
References{{Commons}}
1. ^{{cite book |last=Phipps |first=J.B. |last2=O'Kennon |first2=R.J. |last3=Lance |first3=R.W. |year=2003 |title=Hawthorns and medlars |publisher=Royal Horticultural Society |location=Cambridge, U.K. |isbn=0881925918}} 2. ^TROPICOS entry for series Douglasianae 3. ^{{cite journal |last=Kruschke |first=E.P. |year=1965 |title=Contributions to the taxonomy of Crataegus |journal=Milwaukee Public Museum Publications in Botany |volume=3 |pages=11–273}} 4. ^{{cite journal |last=Phipps |first=J.B. |year=1995 |title=The identity of Crataegus columbiana and its relationship to C. piperi (Rosaceae) |journal=Taxon |volume=44 |issue=3 |pages=405–8 |jstor=1223414}} 5. ^{{cite web|title=Crataegus douglasii|work=WTU Herbarium Image Collection |publisher=Burke Museum, University of Washington|url=http://biology.burke.washington.edu/herbarium/imagecollection.php?Genus=Crataegus&Species=douglasii|accessdate=2009-12-12}} 6. ^{{cite book | last = Pojar | first = Jim |author2=Andy MacKinnon | title = Plants of the Pacific Northwest | publisher = Lone Pine | pages = 73 | year = 1994 | isbn = 1-55105-042-0}} External links
7 : Crataegus|Flora of the Northwestern United States|Flora of Western Canada|Flora of California|Flora of the Great Lakes region (North America)|Flora of the North-Central United States|Flora of North America |
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