Difference between revisions of "Purshia"

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|familia=Rosaceae
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|genus=Purshia
 
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|image=Purshia tridentata 2.jpg
 
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|image_caption=Purshia tridentata
 
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Purshia (after F. T. Pursh, or Pursch, as is the original spelling of his name, 1774-1820; born at Grossenhain, in Saxony; traveled in this country and wrote a flora of North America). Syn., Kunzia. Rosaceae. Low deciduous spreading shrub, allied to Cercocarpus, with alternate, mostly fascicled, small, cuneate and tridentate lvs.: fls. solitary, yellowish; calyx-tube tubular; petals spatulate, 5; stamens numerous; pistils 1 or sometimes 2: fr. a pubescent leathery achene exceeding the persistent calyx. Of little ornamental value with its sparse grayish or bluish green foliage and its rather inconspicuous fls. and frs., and but rarely cult. Probably hardy as far north as Mass., requiring sunny position and well-drained soil; an excess of moisture, especially during the winter, proves fatal to it. Prop. by seeds and probably by layers. The only species is P. tridentata, DC. (Kunzia tridentata, Spreng.). Diffusely branched shrub, attaining 5, rarely 10 ft.: lvs. cuneate-obovate, 3-lobed at the apex, whitish pubescent beneath, 1/4-3/4in. long: fls. solitary on short branchlets, almost sessile, yellowish, about 3/4in. across: fr. ovate-oblong, acuminate. April-July. Ore. to Wyo., New Mex. and Calif. B.R. 1446. Var. glandulosa, Jones (P. glandulosa, Curran), is glandular and has very small, almost glabrous lvs., sometimes pinnately 5-lobed.   
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Purshia (after F. T. Pursh, or Pursch, as is the original spelling of his name, 1774-1820; born at Grossenhain, in Saxony; traveled in this country and wrote a flora of North America). Syn., Kunzia. Rosaceae. Low deciduous spreading shrub, allied to Cercocarpus, with alternate, mostly fascicled, small, cuneate and tridentate lvs.: fls. solitary, yellowish; calyx-tube tubular; petals spatulate, 5; stamens numerous; pistils 1 or sometimes 2: fr. a pubescent leathery achene exceeding the persistent calyx. Of little ornamental value with its sparse grayish or bluish green foliage and its rather inconspicuous fls. and frs., and but rarely cult. Probably hardy as far north as Mass., requiring sunny position and well-drained soil; an excess of moisture, especially during the winter, proves fatal to it. Prop. by seeds and probably by layers. The only species is P. tridentata, DC. (Kunzia tridentata, Spreng.). Diffusely branched shrub, attaining 5, rarely 10 ft.: lvs. cuneate-obovate, 3-lobed at the apex, whitish pubescent beneath, 1/4-3/4in. long: fls. solitary on short branchlets, almost sessile, yellowish, about 3/4in. across: fr. ovate-oblong, acuminate. April-July. Ore. to Wyo., New Mex. and Calif. Var. glandulosa, Jones (P. glandulosa, Curran), is glandular and has very small, almost glabrous lvs., sometimes pinnately 5-lobed.   
 
Alfred Rehder.
 
Alfred Rehder.
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{{Taxobox
 
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| color = lightgreen
 
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| name = ''Purshia''
 
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| image = Purshia tridentata 2.jpg
 
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| image_width = 240px
 
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| image_caption = ''Purshia tridentata''
 
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| regnum = [[Plant]]ae
 
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| divisio = [[Flowering plant|Magnoliophyta]]
 
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| classis = [[Magnoliopsida]]
 
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| ordo = [[Rosales]]
 
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| familia = [[Rosaceae]]
 
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| genus = '''''Purshia'''''
 
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| genus_authority = [[Kurt Sprengel|Spreng.]]
 
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| subdivision_ranks = Species
 
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| subdivision = See text
 
 
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The evergreen species were treated separately in the genus '''''Cowania''''' in the past; this genus is still accepted by some botanists.
 
The evergreen species were treated separately in the genus '''''Cowania''''' in the past; this genus is still accepted by some botanists.
  
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;Species
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Describe the plant here...
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==Cultivation==
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<!--- Type cultivation info below this line, then delete this entire line -->
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===Propagation===
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<!--- Type propagation info below this line, then delete this entire line -->
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===Pests and diseases===
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==Species==
 
*''Purshia ericifolia'' - '''Heath Cliffrose'''. Texas.
 
*''Purshia ericifolia'' - '''Heath Cliffrose'''. Texas.
 
*''Purshia glandulosa'' - '''Desert Bitterbrush'''. Nevada, Utah, Arizona.
 
*''Purshia glandulosa'' - '''Desert Bitterbrush'''. Nevada, Utah, Arizona.
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The classification of ''Purshia'' within the Rosaceae is presently unclear. The genus was originally placed in the subfamily [[Rosoideae]], and later in subfamily [[Dryadeae]] along with the genera ''[[Mountain-mahogany|Cercocarpus]]'', ''[[Chamaebatia]]'' and ''[[Dryas (plant)|''Dryas'']]'', all genera sharing [[root nodule]]s that host the [[nitrogen fixation|nitrogen-fixing]] [[bacterium]] ''[[Frankia]]''. However, recent genetic research indicates that Dryadeae may be polyphyletic, with ''Dryas'' not closely related to the other genera.
 
The classification of ''Purshia'' within the Rosaceae is presently unclear. The genus was originally placed in the subfamily [[Rosoideae]], and later in subfamily [[Dryadeae]] along with the genera ''[[Mountain-mahogany|Cercocarpus]]'', ''[[Chamaebatia]]'' and ''[[Dryas (plant)|''Dryas'']]'', all genera sharing [[root nodule]]s that host the [[nitrogen fixation|nitrogen-fixing]] [[bacterium]] ''[[Frankia]]''. However, recent genetic research indicates that Dryadeae may be polyphyletic, with ''Dryas'' not closely related to the other genera.
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==Gallery==
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{{photo-sources}}<!-- remove this line if there are already 3 or more photos in the gallery  -->
  
 
<gallery>
 
<gallery>
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Image:Purshia tridentata 4.jpg|''P. tridentata'', Red Rock Canyon, Nevada
 
Image:Purshia tridentata 4.jpg|''P. tridentata'', Red Rock Canyon, Nevada
 
</gallery>
 
</gallery>
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==References==
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*[[Standard Cyclopedia of Horticulture]], by L. H. Bailey, MacMillan Co., 1963
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<!--- xxxxx  *Flora: The Gardener's Bible, by Sean Hogan. Global Book Publishing, 2003. ISBN 0881925381  -->
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<!--- xxxxx  *American Horticultural Society: A-Z Encyclopedia of Garden Plants, by Christopher Brickell, Judith D. Zuk. 1996. ISBN 0789419432  -->
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<!--- xxxxx  *Sunset National Garden Book. Sunset Books, Inc., 1997. ISBN 0376038608  -->
  
 
==External links==
 
==External links==
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*[http://ucjeps.berkeley.edu/cgi-bin/get_JM_treatment.pl?Purshia Jepson Flora Project: ''Purshia''] (click 'next taxon' to see species accounts of Californian species)
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*{{wplink}}
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*[http://plants.usda.gov:8080/plants//profile?symbol=PURSH USDA Plants Profile: ''Purshia'']
 
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*[http://www.ars-grin.gov/cgi-bin/npgs/html/splist.pl?10152 Germplasm Resources Information Network: ''Purshia'']
 
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*[http://research.yale.edu/yoderlab/pdfs/2003,%20Eriksson%20et%20al,%20IJPS.pdf Phylogeny of Rosoideae (pdf file)]
 
  
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[[Category:Rosaceae]]
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{{stub}}
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__NOTOC__

Latest revision as of 05:02, 10 December 2009


Purshia tridentata


Plant Characteristics
Cultivation
Scientific Names

Rosaceae >

Purshia >



Read about Purshia in the Standard Cyclopedia of Horticulture 

Purshia (after F. T. Pursh, or Pursch, as is the original spelling of his name, 1774-1820; born at Grossenhain, in Saxony; traveled in this country and wrote a flora of North America). Syn., Kunzia. Rosaceae. Low deciduous spreading shrub, allied to Cercocarpus, with alternate, mostly fascicled, small, cuneate and tridentate lvs.: fls. solitary, yellowish; calyx-tube tubular; petals spatulate, 5; stamens numerous; pistils 1 or sometimes 2: fr. a pubescent leathery achene exceeding the persistent calyx. Of little ornamental value with its sparse grayish or bluish green foliage and its rather inconspicuous fls. and frs., and but rarely cult. Probably hardy as far north as Mass., requiring sunny position and well-drained soil; an excess of moisture, especially during the winter, proves fatal to it. Prop. by seeds and probably by layers. The only species is P. tridentata, DC. (Kunzia tridentata, Spreng.). Diffusely branched shrub, attaining 5, rarely 10 ft.: lvs. cuneate-obovate, 3-lobed at the apex, whitish pubescent beneath, 1/4-3/4in. long: fls. solitary on short branchlets, almost sessile, yellowish, about 3/4in. across: fr. ovate-oblong, acuminate. April-July. Ore. to Wyo., New Mex. and Calif. Var. glandulosa, Jones (P. glandulosa, Curran), is glandular and has very small, almost glabrous lvs., sometimes pinnately 5-lobed. Alfred Rehder.


The above text is from the Standard Cyclopedia of Horticulture. It may be out of date, but still contains valuable and interesting information which can be incorporated into the remainder of the article. Click on "Collapse" in the header to hide this text.


Purshia (bitterbrush or cliff-rose) is a small genus of 5-8 species of flowering plants in the family Rosaceae, native to western North America, where they grow in dry climates from southeast British Columbia in Canada south throughout the western United States to northern Mexico.

They are deciduous or evergreen shrubs, typically reaching 0.3-5 m tall. The leaves are small, 1-3 cm long, deeply three- to five-lobed, with revolute margins. The flowers are 1-2 cm diameter, with five white to pale yellow or pink petals and yellow stamens. The fruit is a cluster of dry, slender, leathery achenes 2-6 cm long.

The evergreen species were treated separately in the genus Cowania in the past; this genus is still accepted by some botanists.

Describe the plant here...

Cultivation

Propagation

Pests and diseases

Species

  • Purshia ericifolia - Heath Cliffrose. Texas.
  • Purshia glandulosa - Desert Bitterbrush. Nevada, Utah, Arizona.
  • Purshia mexicana - Mexican Cliffrose (syn. Cowania mexicana). Mexico, Arizona.
  • Purshia pinkavae - Pinkava's Cliffrose. Arizona.
  • Purshia plicata - Antelope Bush (syn. Cowania plicata). Mexico (Nuevo León).
  • Purshia stansburiana - Stansbury Cliffrose (syn. P. mexicana var. stansburiana, Cowania stansburiana). Idaho south to California, Arizona and New Mexico.
  • Purshia subintegra (possibly a hybrid between P. pinkavae and P. stansburiana). Arizona.
  • Purshia tridentata - Antelope Bitterbrush. British Columbia south to California and New Mexico.

The classification of Purshia within the Rosaceae is presently unclear. The genus was originally placed in the subfamily Rosoideae, and later in subfamily Dryadeae along with the genera Cercocarpus, Chamaebatia and Dryas, all genera sharing root nodules that host the nitrogen-fixing bacterium Frankia. However, recent genetic research indicates that Dryadeae may be polyphyletic, with Dryas not closely related to the other genera.

Gallery

If you have a photo of this plant, please upload it! Plus, there may be other photos available for you to add.

References

External links


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