Picea chihuahuana, the Chihuahua spruce, is a medium-sized evergreen tree growing to 25–35 m tall, and with a trunk diameter of up to 1 m. It is native to northwest Mexico, where it occurs in 25 small populations in the Sierra Madre Occidental mountains in Chihuahua and Durango.
The leaves are needle-like, 17–23 mm long, stout, rhombic in cross-section, bright glaucous blue-green with conspicuous lines of stomata; the tip is viciously sharp.
They have stiff, bluntly rounded scales 1.5–2 cm broad, and are green, maturing pale brown 6–8 months after pollination.
Chihuahua spruce was only discovered in 1942 by the Mexican botanist Maximino Martínez, and is endangered with just 25 small populations, none comprising more than a few hundred trees.
It is a very attractive tree and is starting to be planted as an ornamental tree in botanical gardens, particularly valued in warm areas as it is one of the most heat-tolerant of all spruces, more tolerant of summer heat than Blue Spruce, which it resembles in foliage.