Avocados are the fruit from the Persea Americana, a tall evergreen tree that can grow up to 65 feet in height. There are dozens of varieties of avocadoes, which fall into three main categories--Mexican, Guatemalean, and West Indian--which differ in their size, appearance, quality and susceptibility to cold. The most popular type of avocado in the United States is the Haas variety, which has rugged, pebbly brown-black skin. Another common type of avocado is the Fuerte, which is larger than the Haas and has smooth, dark green skin and a more defined pear shape.
Avocados vary in weight from 8 ounces to 3 pounds depending upon the variety. The edible portion of the avocado is its yellow-green flesh, which has a luscious, buttery consistency and a subtle nutty flavor. The skin and pit are inedible.
Info whfood.com.