A Definition of Treeline
Relative to Timberline and Krummholz Line
Timberline: The upper-most limit in elevation that dense concentrations of upright trees exist.
Treeline: The upper-most limit in elevation that upright trees exist.
Krummholz Line: Krummholz is a growth form followed the trees at locations of great environmental stress, such as high wind. At lower elevations, where more favorable conditions exist, the same species that form into krummholz grow upright. The krummholz line is the upper-most limit in elevation that trees in krummholz form exist.