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A spruce is a tree of the genus Picea a genus of about 35 species of coniferousШУУД ҮЗЭХ distinguished
A spruce is a tree of the genus Picea /paɪˈsiːə/,[1] a genus of about 35 species of coniferous evergreen trees in the Family Pinaceae, found in the northern temperate and boreal (taiga) regions of the earth. Spruces are large trees, from about 20-60 metres (about 60-200 feet) tall when mature, and can be distinguished by their whorled branches and conical form. The needles, or leaves, of spruce trees are attached singly to the branches in a spiral fashion, each needle on a small peg-like structure called a pulvinus. The needles are shed when 4–10 years old, leaving the branches rough with the retained pulvinus (an easy means of distinguishing them from other similar genera, where the branches are fairly smooth). Spruces are used as food plants by the larvae of some Lepidoptera (moth and butterfly) species; see list of Lepidoptera that feed on spruces. They are also used by the larvae of gall adelgids (Adelges species). In the mountains of western Sweden scientists have found a Norway Spruce tree, nicknamed Old Tjikko, which by reproducing through layering has reached an age of 9,550 years and is claimed to be the world's oldest known living tree. Determining that a tree is a member of a spruce species is not difficult; evergreen needles that are more or less 4-angled, and especially the pulvinus, give it away. But beyond that, determination can become more difficult. Intensive sampling in the Smithers/Hazelton/Houston area of British Columbia showed Douglas (1975),[5] according to Coates et al. (1994),[6] that cone scale morphology was the feature most useful in differentiating species of spruce; the length, width, length: width ratio, the length of free scale (the distance from the imprint of the seed wing to the tip of the scale), and the percentage free scale (length of free scale as a percentage of the total length of the scale) were most useful in this regard. Daubenmire (1974),[7] after range-wide sampling, had already recognized the importance of the 2 latter characters. Taylor (1959)[8] had noted that the most obvious morphological difference between typical Picea glauca and typical P. engelmannii was the cone scale, and Horton (1956,1959)[9][10] found that the most useful diagnostic features of the 2 spruces are in the cone; differences occur in the flower, shoot and needle, “but those in the cone are most easily assessed” (Horton 1959).[10] Coupé et al. (1982)[11] recommended that cone scale characters be based on samples taken from the mid-section of each of 10 cones from each of 5 trees in the population of interest.