Tsuga diversifolia

northern Japanese species

PinaceaeTsuga

Northern Japanese hemlock, or Japanese hemlock is in the pine or Pinaceae family and is native to the Japanese islands of Honshu, Kyūshu, and Shikoku. It grows to a height of about 25 m, at higher elevations.

  • Tree crown is narrow, dense and conical, becoming rounded with age.
  • Needle-like leaves are flat, up to 0.5–1.5 cm long, spirally arranged but appearing 2-ranked. Upper side of leaf is grooved, dark green, glossy and underside is lighter colour with 2 white bands of stomata; apex (tip of leaf) is notched, petioles are crooked.
  • Species is monoecious; pollen (staminate) cones are dark purple, 3-4 mm long, pale green, with centers and margins a deep purple. Seed (pistillate) cones are cylindric-ovoid, non-fragmenting, pendulous, nearly sessile (no stems) cones 1.8–2.8 cm long by 1 cm wide, originally green but maturing to dark brown. Scales are lightly convex and ridged.
  • Young shoots are short, bright orange to red-brown; buds are ovoid, deep purple-red; bark is an orange-brown in colour, shallowly fissured and vertically peeling.

Contributors

  • Philippe de Spoelberch