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		Mackenzie's Willow - Salix eriocephala var. mackenzieana  
		
			
				Other Names:  
				
				Salix prolixa 
			
		
		
		
		
            
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Native Species  
			Global Rank : 
G5T4 
			State Rank : 
S5 
			
				C-value : 
7 
			
			
			
			Agency Status  
			USFWS : 
 
			USFS : 
 
			BLM : 
 
		
			
			
				
			 
			
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		General Description
		We do not yet have descriptive information on this species.  Please try the buttons above to search for information from other sources.
		
	
	 
	Species Range
	
		
			Montana Range 
		Range Descriptions  
			 
			
			
					
						 
						Native 
					 
				
				
					
			 
			
		 
		
	 
	
    		Range Comments
			Alaska to California, east to northeastern Canada and south to Virginia. 
			
		
		Observations in Montana Natural Heritage Program Database
		Number of Observations:  16
		
		
(Click on the following maps and charts to see full sized version) 
		Map Help and Descriptions  
		
		
			
				Relative Density 
				 
			 
		
			
				Recency 
				 
			 
		
		 
		
			
				 
			
				 
			
					 
				
			(Observations spanning multiple months or years are excluded from time charts) 
		 
		
			
		
		
	
		Ecology
		POLLINATORS  The following animal species have been reported as pollinators of this plant species or its genus where their geographic ranges overlap: 
Bombus vagans , 
Bombus bifarius , 
Bombus fervidus , 
Bombus frigidus , 
Bombus huntii , 
Bombus melanopygus , 
Bombus ternarius , 
Bombus terricola , 
Bombus sitkensis , 
Bombus occidentalis , 
Bombus pensylvanicus , 
Bombus bimaculatus , 
Bombus griseocollis , 
Bombus impatiens , and 
Bombus suckleyi  (Plath 1934, Macior 1968, Heinrich 1976, Thorp et al. 1983, Colla and Dumesh 2010, Colla et al. 2011, Koch et al. 2012, Williams et al. 2014).
 
		
	
		Stewardship Responsibility
		
		
	
	References
	
		
			Literature Cited AboveLegend:    View Online Publication  Colla, S., L. Richardson, and P. Williams. 2011. Bumble bees of the eastern United States. Washington, DC: USDA Forest Service, Pollinator Partnership. 103 p. Colla, S.R. and S. Dumesh. 2010. The bumble bees of southern Ontario: notes on natural history and distribution. Journal of the Entomological Society of Ontario 141:39-68. Koch, J., J. Strange, and P. Williams. 2012. Bumble bees of the western United States. Washington, DC: USDA Forest Service, Pollinator Partnership. 143 p. Macior, L.M. 1968. Bombus  (Hymenoptera, Apidae) queen foraging in relation to vernal pollination in Wisconsin. Ecology 49:20-25. Plath, O.E. 1934. Bumblebees and their ways. New York, NY: Macmillan Company. 201 p. Thorp, R.W., D.S. Horning, and L.L. Dunning. 1983. Bumble bees and cuckoo bumble bees of California (Hymenoptera: Apidae). Bulletin of the California Insect Survey 23:1-79. Williams, P., R. Thorp, L. Richardson, and S. Colla. 2014. Bumble Bees of North America. Princeton, NJ: Princeton University Press. 208 p. 
			Additional ReferencesLegend:    View Online Publication Do you know of a citation we're missing?  Argus, G. 2010. Salix. In: Flora of North America Editorial Committee, eds. 1993+. Flora of North America North of Mexico. 16+ vols. New York and Oxford. Vol. 7. Dorn, R.D. 2010. The genus Salix in North America north of Mexico. 59 pp. Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p. Lesica, P., M.T. Lavin, and P.F. Stickney. 2022. Manual of Montana Vascular Plants, Second Edition. Fort Worth, TX: BRIT Press. viii + 779 p. Little, E.L., Jr. 1979. Checklist of United States trees (native and naturalized). Agriculture Handbook No. 541. U.S. Forest Service, Washington, D.C. 375 pp. 
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