Source : Webster's Revised Unabridged Dictionary (1913)

Subalpine \Sub*al"pine\, a. [L. subalpinus.] (Bot. & Zo["o]l.)
   Inhabiting the somewhat high slopes and summits of mountains,
   but considerably below the snow line.

Source : WordNet®

subalpine
     adj : growing at high altitudes [syn: {alpestrine}]