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The date of earliest appearance of grasslands varies from region to region.
Grasslands are one of the most widespread of all the major vegetation types of the world.
Deserts are found where moisture is so lacking that a continuous, permanent vegetation cover cannot be maintained. Cenozoic Era (65.5 million years ago to the present).
Indeed, the grass family itself (Poaceae or Gramineae) evolved only early in this era.
In wet tropical regions these types of grasslands may be very dense, such as those in East Africa that are dominated by climates are varied, but all large regions of natural grassland are generally hot, at least in summer, and dry, though not to the extent that deserts are.
In general, tropical grasslands receive 500 to 1,500 millimetres (20 to 60 inches) of wet season.