Are the needles arranged mostly in clusters of 2-5 and EVERGREEN? 

These are pine trees.

Are the needles DECIDUOUS, 1-11/2" long, and mostly arranged in clusters of many on short, spur-like branches? 

CLUE: cones are upright and 1" long. 

It is a western larch.

Are the needles arranged singly, less than 2" long; cones 1-2" long with a few thick, often prickly scales; and large, edible, wingless seeds? 

CLUE: the tree is native in scattered areas from southern Idaho to Mexico. 

It is a singleleaf pinyon.

Are the needles arranged singly and EVERGREEN but different than above?