If you go to the store and want to buy some grass seed, you’ll probably have a choice of a dozen kinds. That seems like quite a variety of grasses—but it doesn’t give you any idea at all of the true picture.

True grasses, as they are classified scientifically, include such things as corn, wheat, rye, barley, rice, and oats! As a matter of fact, there are actually about 4,500 kinds of grasses.