
There are 10,000 species of grass. Even if you look closely at a patch in your own garden or in a public park (so long as its not cut down to the very root) you will see quite a variety in that one small area.
They are economically the most important of all flowering plants because of their nutritious grains and soil-forming function, and they have the most-widespread distribution and the largest number of individuals.
Britannica



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