 Siberian spruce and Norway spruce ("Picea abies") have turned out to be extremely similar genetically and might be considered two closely related subspecies of "P. abies".Siberian spruce hybridises extensively with Norway spruce where the two species (or subspecies) meet in northeastern Europe; trees over a broad area from extreme northeast Norway and northern Finland east to the Ural Mountains are classified as the hybrid "Picea × fennica" (Regel) Komarov (or "P. abies" subsp.×"fennica", if the two taxa are considered subspecies); they differ from typical "P. obovata" from east of the Urals in having cones with less smoothly rounded, often triangular-pointed, scales.