Rocky Mountain Douglas-fir

(Pseudotsuga menziesii var. glauca)

Conservation Status
Rocky Mountain Douglas-fir
Photo by Randy
  IUCN Red List

LC - Least Concern

     
  NatureServe

N5 - Secure

SNR - Unranked

     
  Minnesota

not listed

     
           
Wetland Indicator Status
     
  Great Plains

FACU - Facultative upland

     
  Midwest

FACU - Facultative upland

     
  Northcentral & Northeast

FACU - Facultative upland

     
           
 
Description
 
 

Rocky Mountain Douglas-fir is a medium-sized to large tree. It can be from 40 to 131 tall or taller at maturity, though in Minnesota it is rarely exceeds 70 in height.

Principal branches are more or less ascending.

Needles are bluish-green to dark green or grayish-green and have a strong odor when crushed. They are borne singly and arranged spirally around the twig. They are not sheathed at the base.

Seed cones are 1½ to 2¾ long and erect at first, bending downward after pollination. Each scale on the seed cone is subtended by a 3-pronged bract that is longer than and partially obscures the scale. The bract spreads outward and is often bent backward. The cone drops from the tree intact.

 
     
 

Height

 
 

40 to 131

 
     
 

Similar Species

 
     
     
 
Habitat
 
 

Coniferous or mixed forests

 
     
 
Biology
 
 

Pollination

 
 

Mid-April to late June

 
     
 
Use
 
 

Rocky Mountain Douglas-fir is an important timber tree and a popular choice for a Christmas tree.

 
     
 
Distribution
 
 

Distribution Map

 

Sources

2, 3, 4, 22, 29, 30.

 
  4/30/2021      
         
 

Nativity

 
 

Native to Western North America from the Rocky Mountains east to Montana and south to west Texas. Introduced. Occasionally spreads from cultivation.

 
         
 

Occurrence

 
 

Rare in Minnesota

 
         
 
Taxonomy
 
  Kingdom Plantae (green algae and land plants)  
  Subkingdom Viridiplantae (green plants)  
  Infrakingdom Streptophyta (land plants and green algae)  
  Superdivision Embryophyta (land plants)  
  Division Tracheophyta (vascular plants)  
  Subdivision Spermatophytina (seed plants)  
  Class Pinopsida (conifers)  
  Subclass Pinidae  
 

Order

Pinales (pines)  
 

Family

Pinaceae (pines)  
  Subfamily Laricoideae  
 

Genus

Pseudotsuga (Douglas-firs)  
  Species Pseudotsuga menziesii (Douglas fir)  
       
 

Subordinate Taxa

 
 

 

 
       
 

Synonyms

 
 

Pseudotsuga flahaultii

Pseudotsuga menziesii var. flahaultii

Pseudotsuga taxifolia var. glauca

Tsuga douglasii var. glauca

 
       
 

Common Names

 
 

blue Douglas-fir

Colorado Douglas-fir

Douglas-fir

inland Douglas-fir

Rocky Mountain Douglas-fir

 
       

 

 

 

 

 

 

 

 

 

       
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Randy
       

Self-pruning, loose habit

  Rocky Mountain Douglas-fir    
       

Bark

  Rocky Mountain Douglas-fir    
       

Midsummer cones showing characteristic bracts

  Rocky Mountain Douglas-fir    
       
       
MinnesotaSeasons.com Photos
   
       
       
       

 

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Slideshows
   
  Pseudotsuga menziesii
Blake C. Willson
 
  Pseudotsuga menziesii  
 
About

Douglas-fir

 
     

 

slideshow

       
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Other Videos
 
  Pseudotsuga menziesii var. glauca (Blue Douglas Fir)
Plantwalks
 
   
 
About

Published on Jan 21, 2013

   
       

 

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Randy
2015

Location: Freeborn County, MN

Self-pruning, loose habit

Rocky Mountain Douglas-fir


     
     
 
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Created: 1/1/2017

Last Updated:

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