A treeless wetland ecosystem is a Marsh.
A treeless zone is called Tundra.
There are called Tundra
A treeless saddle
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the tundra
a desert?
The prairie or great plains. In Africa it is called the Savannah or veld.
A cold treeless lowland area, permanently frozen, known as Tundra. It supports small shrubs, mosses and grasses
Llano
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A treeless plain where grasses and moss grow is called a grassland or a tundra. Grasslands are characterized by vast stretches of grasses with few or no trees, while tundras are cold regions where mosses and grasses are the dominant vegetation due to harsh conditions for tree growth.