USA trees.

Just beautiful photographs

Spruces (Picea)

What kind of species are you dealing with.

Norway_spruce Picea_abies | Serbian_spruce Picea_omorika | Blue_spruce Picea_pungens | Oriental_spruce | Sitka spruce | Black_spruce (foreign)

Spruces are pretty hard to keep apart. Luckely the most common species are not very hard. Spruces have needles that stand alone, not in bunches and leatherish/woody cones that hang from the branches.

A simple, but not always accurate key is below:

Below a more elaborate description.