Picea engelmannii - Distribution and Occurrence; Value and Use; Characteristics; Fire Ecology Picea pungens - Information on distribution and occurrence, value and use, characteristics, and fire ecology. Picea rubens - Distribution and Occurrence; Value and Use; Characteristics; Fire Ecology Picea chihuahuana - Description and photographs. Picea pungens: Blue Spruce - Research project by Kyle Hanford at the University of Wisconsin-LaCrosse. Picea pungens: Colorado Blue Spruce - Research project by Spencer Loch at the University of Wisconsin-LaCrosse. Picea - Description of the genus of the spruce tree, including taxonomy, range, ethnobotany, and the largest and oldest known specimens. Links to information on some species.