Original: A spruce is a tree of the genus Picea,Sunset Western Garden Book, 1995:606–607 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.
Simplified: Spruce are trees of the genus Picea, a genus of about 35 species of coniferous evergreen trees in the Family Pinaceae, found in the northern temperate and taiga regions of the earth.