Description
It is a large, fast-growing evergreen coniferous tree growing to 35-55 m (115–180 ft) tall and with a trunk diameter of up to 1-1.5 m. The shoots are orange-brown and glabrous (hairless). The leaves are needle-like, 12–24 mm long, quadrangular in cross-section (not flattened), and dark green on all four sides with inconspicuous stomatal lines. The cones are 9–17 cm long (the longest of any spruce), and have bluntly to sharply triangular-pointed scale tips. They are green or reddish, maturing brown 5–7 months after pollination. The seeds are black, 4–5 mm long, with a pale brown 15 mm wing.
The tallest measured Norway Spruce, 63 m (207 ft) tall, is in Perucica Virgin Forest, Sutjeska National Park, Bosnia-Herzegovina.
Populations in southeast Europe tend to have on average longer cones with more pointed scales; these are sometimes distinguished as Picea abies var. acuminata (Beck) Dallim. & A.B.Jacks., but there is extensive overlap in variation with trees from other parts of the range.
Some botanists treat Siberian Spruce as a subspecies of Norway Spruce, though in their typical forms, they are very distinct, the Siberian Spruce having cones only 5–10 cm long, with smoothly rounded scales, and pubescent (hairy) shoots. Genetically Norway and Siberian Spruces have turned out to be extremely similar and may be considered as two closely related subspecies of P. abies.
Another spruce with smoothly rounded cone scales and hairy shoots occurs rarely in the central Alps in eastern Switzerland. It is also distinct in having thicker, blue-green leaves. Many texts treat this as a variant of Norway Spruce, but it is as distinct as many other spruces, and appears to be more closely related to Siberian Spruce, Schrenk's Spruce (P. schrenkiana) from central Asia and Morinda Spruce (P. smithiana) in the Himalaya. Treated as a distinct species, it takes the name Alpine Spruce (Picea alpestris (Brügger) Stein). As with Siberian Spruce, it hybridises extensively with Norway Spruce; pure specimens are rare. Hybrids are commonly known as Norwegian Spruce, which should not be confused with the pure species Norway Spruce.
Read more about this topic: Picea Abies
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