Sitka mountain-ash

  • Latin name: Sorbus sitchensis M.J. Roem.
  • French name: Sorbier de Sitka
  • Synonym(s): Pacific mountain-ash
  • Taxonomic Serial Number: 25327
Description

Leaves

  • Leaf - Sitka mountain-ash

Form

  • 7–11 leaflets
  • Elliptic, stalkless

Length

  • Leaflets 2–6 cm
  • Central stalk 8–15 cm

Colour

  • Central stalk red
  • Upper surface dark green
  • Lower surface paler

Margin 

  • Toothed toward the tip

Buds

  • Lateral bud and leaf scar - Sitka mountain-ash

Form

  • Terminal bud cone-shaped
  • Pointed, sticky

Length

  • 6–15 mm

Colour

  • Reddish

Twigs

Form

  • Hairy when young

Colour

  • Reddish-brown with silvery dots

Flowers

Form

  • Small, in erect, rounded clusters (corymbs)

Width

  • 6–8 mm

Structure

  • Synoecious

Fruits

Width

  • Fruits 10–12 mm
  • Clusters 5–10 cm

Colour

  • Red, orange, or purple

Structure

  • Pome

Bark

Form

  • Smooth, separating into small curling scales with age

Colour

  • Light grey

Size

Height

  • To 6 m

Tree form

Forest-grown

Crown

  • Rounded

Habitat

Site

  • Common on disturbed sites
  • Reaches the alpine tree line

Range

From British Columbia inland to western Alberta

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