alpestrine

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Growing at high altitudes; alpine or subalpine.

from The Century Dictionary.

• Pertaining or peculiar to the Alps, or other mountainous regions: as, “alpestrine diseases,” Dana.
• In botany, growing on mountains below the alpine region, that is, below the limit of tree-growth as determined by cold.

from the GNU version of the Collaborative International Dictionary of English.

• adjective Pertaining to the Alps, or other high mountains
• adjective (Bot.) Growing on the elevated parts of mountains, but not above the timber line; subalpine.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• adjective growing at high altitudes