Rocky Mountain juniper

Silhouette - Rocky Mountain juniper
  • Latin name: Juniperus scopulorum Sarg.
  • French name: Genévrier des Rocheuses
  • Synonym(s): Western juniper
  • Taxonomic Serial Number: 194872
  • NA3 , C3
Description

Leaves

  • Outer surface of scale leaf with gland (left), inner surface (right) - Rocky Mountain juniper
  • Leafy shoot - Rocky Mountain juniper
  • Scale leaves - Rocky Mountain juniper

Form

  • Scale leaves with a gland on the outer surface
  • Successive pairs barely overlapping

Length

  • Needle-shaped leaves about 12 mm

Colour

  • Pale yellowish-green to whitish-green in summer and winter

Twigs

Form

  • Leaf-covered twigs coarse

Colour

  • Pale brown

Seed cones (mature)

  • Seed cone (left); seeds (right) - Rocky Mountain juniper

Form

  • Berry-like
  • Fleshy, fragrant, powdery coating

Length

  • 8 mm

Colour

  • Blue with a white coating

Timing

  • Ripen in the 2nd autumn, may persist another 2 years

Bark

Form

  • Thin, fibrous
  • Divided into flat-topped, interlacing, persistent shreds

Colour

  • Reddish- or greyish-brown

Wood

Texture

  • Moderately heavy and hard, weak
  • Strongly aromatic
  • Heartwood resistant to decay

Colour

  • Heartwood reddish-brown, often streaked with white
  • Sapwood nearly white

Size

Height

  • To 10 m, occasionally 25 m
  • The largest native juniper

Diameter

  • To 30 cm, occasionally 90 cm

Tree form

  • Silhouette - Rocky Mountain juniper

Open-grown

Trunk

  • Often forked

Crown

  • Irregularly conical, coarsely branched
  • Lower branches long, ascending, originating near the base
  • Upper branches short, partly horizontal and partly ascending

Forest-grown

Trunk

  • Dead branches often persist on the trunk

Crown

  • Slender, branches often drooping

Habitat

Site

  • Usually on mountains, but also found near sea level in the coastal forest
  • Dry rocky ridges or sandy soils

Light tolerance

  • Full sun

Associated species

  • In pure but open stands, or as a shrub layer under other species such as Douglas-fir and ponderosa pine

Range

A western species

Insects and diseases

Insects and diseases that are found most frequently and/or that cause the most damage in our Canadian forests.

Photos
  • Rocky Mountain juniper
  • Rocky Mountain juniper
  • Rocky Mountain juniper
  • Rocky Mountain juniper
Distribution map
Distribution map - Rocky Mountain juniper
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