
Alpine tundra is a type of natural region or biome that does not contain trees because it is at high altitude. The high altitude causes an adverse climate, which is too cold and windy to support tree growth. Alpine tundra transitions to subalpine forests below the tree line; stunted forests occurring at the forest-tundra ecotone are known as Krumm...
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http://en.wikipedia.org/wiki/Alpine_tundra

(from the article `tundra`) Alpine tundras begin above the timberline, either on gentle slopes where the soil has developed large meadow areas or on windswept slopes where ...
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http://www.britannica.com/eb/a-z/a/52

High altitude biome dominated by a few species of dwarf shrubs, a few grasses, sedges, lichens, and mosses. Productivity is low in this biome because of the extremes of climate. Quite similar to tundra.
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http://www.physicalgeography.net/physgeoglos/a.html

Ecosystem found above the tree line on mountains; it consists of rugged, well-drained terrain interspersed with meadows with low-growing vegetation and a profusion of summer-blooming wildflowers. Very few birds breed in this harsh environment.
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https://academy.allaboutbirds.org/bird-academys-a-to-z-glossary-of-bird-ter

a tundra that is treeless because of high elevation rather than high latitude.
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https://www.infoplease.com/dictionary/alpine-tundra
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