Southwestern White Pine
Mexican White Pine
Chihuahua White Pine
Native to (or naturalized in) Oregon:
- Conifer, evergreen tree, to 90 (27 m) tall, open, irregular crown, branches are long and horizontal to pendant. Bark is thin, rough, and furrowed. Needles are 6-10 cm long in fascicles of five, bundle sheath abscising soon; needles soft, finely serrated near tips, thin bluish-green with white stomatal lines only on inner surfaces. Cones are 15-25 cm long with reflexed, thick scales; open (dehiscent) when mature, which occurs in late summer; seeds are essentially wingless 10-12 mm long.
- Sun. Reportedly the best growth occurs on moist, cool sites with deep soil.
- Hardy to USDA Zone 4 Native to the mountains of western Texas, New Mexico, Arizona, and southwestern Colorado and into the mountains to central Mexico; most of its distribution is in Mexico. Pinus strobiformis overlaps P . flexilis and reportedly hybridizes with it. On average P . strobiformis has longer, more slender leaves and thinner, more spreading-tipped apophyses (the parts of the cone scales exposed when the cone is closed) than are found in P . flexilis, and stomatal bands are not evident on the abaxial surface of its leaves (Flora of North America, www.eFloras.org).
- strobiformis: Latin strobus, gum yielding tree; formis, in the form or shape of, (possibly a reference to its appearance being similar to Pinus strobus, (Eastern) White Pine).