Purshia

Purshia
	Purshia stansburyana
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Rosids
Order:	Rosales
Family:	Rosaceae
Subfamily:	Dryadoideae
Genus:	Purshia; DC.exPoir.
Type species
	Purshia tridentata;
	Range
Synonyms
	CowaniaD.Don ex Tilloch & Taylor; GreggiaEngelm.; KunziaSpreng.;

Purshia(bitterbrushorcliff-rose) is a smallgenusof 5–8 species offlowering plantsin the familyRosaceaewhich are native to westernNorth America.

Description

Purshiaspecies formdeciduousorevergreen shrubs,typically reaching0.3–5 metres (1–16+1⁄2feet) tall. Theleavesare1–3 centimetres (1⁄2–1+1⁄4inches) long, deeply three- to five-lobed, with revolute margins. Theflowersare 1–2 cm in diameter, with five white to pale yellow or pink petals and yellow stamens. Thefruitis a cluster of dry, slender, leatheryacheneswhich are 2–6 cm long. The roots havenodulesthat hostnitrogen-fi xingFrankiabacterium.^[1]

Taxonomy

Taxonomic history

The genus was originally placed in the subfamilyRosoideae.^[2]In the past, theevergreenspecies were treated separately in the genusCowania;this genus is still accepted by some botanists.

Modern classification

The classification ofPurshiawithin the familyRosaceaehas been unclear.^[3]^[4]It is now placed in the subfamilyDryadoideae.^[2]

Species

Purshiacomprises the following species:^[5]^[6]

Purshia ericifolia(Torr. ex A.Gray) Henr.– Heath cliffrose (Texas)
Purshia glandulosaCurran– Desert bitterbrush (Nevada, Utah, Arizona)
Purshia mexicana(D.Don) Henr.– Mexican cliffrose (Mexico, Arizona)
Purshia pinkavaeSchaack–Pinkava'scliffrose (Arizona)
Purshia plicata(D.Don) Henrard(syn.Cowania plicata) – Antelope bush (Nuevo León, Mexico).
Purshia stansburyana(Torr.) Henr.– Stansbury cliffrose (Idaho south to California, Arizona and New Mexico)
Purshia tridentata(Pursh) DC.– Antelope bitterbrush (British Columbia south to California and New Mexico)

Hybrids

The followinghybridhas been described:^[5]

Purshia×subintegra(Kearney) Henr.(P. pinkavae×P. stansburyana) – (Arizona)

Species names with uncertain taxonomic status

The status of the following species and hybrids is unresolved:^[5]

Purshia ciliataDennst.
Purshia mollisLehm.
Purshia plicata(D.Don) Henr.
Purshia subintegra(Kearney) Henrickson

Distribution and habitat

The genus is native to westernNorth America,where the species grow in dry climates from southeastBritish Columbia,Canada,south throughout thewestern United Statestonorthern Mexico.

Gallery

P. tridentata,Lava Beds National Monument
P. stansburiana,Red Rock Canyon,Nevada
P. stansburiana,Red Rock Canyon, Nevada

References

^Swensen, S.M.; Mullin, B.C. (1997). "The impact of molecular systematics on hypotheses for the evolution of root nodule symbioses and implications for expanding symbioses to new host plant genera".Plant and Soil.194(1–2): 185–192.doi:10.1023/A:1004240004063.
^^a ^bPotter, D.; Eriksson, T.; Evans, R.C.; Oh, S.; Smedmark, J.E.E.; Morgan, D.R.; Kerr, M.; Robertson, K.R.; Arsenault, M.; Dickinson, T.A.; Campbell, C.S. (2007). "Phylogeny and classification of Rosaceae".Plant Systematics and Evolution.266(1–2): 5–43.doi:10.1007/s00606-007-0539-9.
^Morgan, D.R.; Soltis, D.E.; Robertson, K.R. (1994). "Systematic and evolutionary implications of rbcL sequence variation in Rosaceae".American Journal of Botany.81(7): 890–903.doi:10.1002/j.1537-2197.1994.tb15570.x.JSTOR 2445770.
^Eriksson, T.; Hibbs, M.S.; Yoder, A.D.; Delwiche, C.F.; Donoghue, M.J. (2003). "The phylogeny of Rosoideae (Rosaceae) based on sequences of the internal transcribed spacers (ITS) of nuclear ribosomal DNA and the trnL/F region of chloroplast DNA".International Journal of Plant Sciences.164(2): 197–211.doi:10.1086/346163.
^^a ^b ^c"The Plant List entry forPurshia".The Plant List,v.1.1.Royal Botanic Gardens, Kewand theMissouri Botanical Garden.September 2013.Retrieved15 December2020.
^Govaerts R."PurshiaDC. ex Poir ".Plants of the World Online.Board of Trustees of the Royal Botanic Gardens, Kew.Retrieved15 December2020.

External links

Media related toPurshiaat Wikimedia Commons
Jepson Flora Project:Purshia—(click 'taxon' to see treatments of California native species)

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[1] Swensen, S.M.; Mullin, B.C. (1997). "The impact of molecular systematics on hypotheses for the evolution of root nodule symbioses and implications for expanding symbioses to new host plant genera".Plant and Soil.194(1–2): 185–192.doi:10.1023/A:1004240004063.

[:0-2] Potter, D.; Eriksson, T.; Evans, R.C.; Oh, S.; Smedmark, J.E.E.; Morgan, D.R.; Kerr, M.; Robertson, K.R.; Arsenault, M.; Dickinson, T.A.; Campbell, C.S. (2007). "Phylogeny and classification of Rosaceae".Plant Systematics and Evolution.266(1–2): 5–43.doi:10.1007/s00606-007-0539-9.

[3] Morgan, D.R.; Soltis, D.E.; Robertson, K.R. (1994). "Systematic and evolutionary implications of rbcL sequence variation in Rosaceae".American Journal of Botany.81(7): 890–903.doi:10.1002/j.1537-2197.1994.tb15570.x.JSTOR 2445770.

[4] Eriksson, T.; Hibbs, M.S.; Yoder, A.D.; Delwiche, C.F.; Donoghue, M.J. (2003). "The phylogeny of Rosoideae (Rosaceae) based on sequences of the internal transcribed spacers (ITS) of nuclear ribosomal DNA and the trnL/F region of chloroplast DNA".International Journal of Plant Sciences.164(2): 197–211.doi:10.1086/346163.

[PlantList-5] "The Plant List entry forPurshia".The Plant List,v.1.1.Royal Botanic Gardens, Kewand theMissouri Botanical Garden.September 2013.Retrieved15 December2020.

[POWO-6] Govaerts R."PurshiaDC. ex Poir ".Plants of the World Online.Board of Trustees of the Royal Botanic Gardens, Kew.Retrieved15 December2020.

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