Bosnian Pine Pinus heldreichii var. leucodermis
This tree is very popular in Europe but works well in Colorado up to 8,000 feet. This tree is very slow growing (3-6″ per year). The dark green needles may stay on the tree up to 6 years. This tree does well near the street as it tolerates salt. It can reach 30′ and 15′ wide.