Question

What is called tundra vegetation

Answer 1

Tundra vegetation is the plants that grow in regions with extremely cold temperature.
there are three types of tundra:
arctic tundra
alpine tundra
antarctic tundra 
In tundra the vegetation is composed of dwarf shrubs, sedges and grasses, mosses and lichens. Scattered trees grow in some tundra region.

Answer 2

TUNDRA REGION ARE EXTREMELY COLD REGION  WHICH HAS THE PLANTS ACCORDINGLY ADAPTED.
ANTARCTIC TUNDRA
ARCTIC TUNDRA
ALPINE TUNDRA ARE THE THREE TYPES OF TUNDRA REGION.
THERE THE TREES HAVE CONE LIKE STRUCTURE AND THE LEAVES ARE MODIFIED TO NEEDLES.