Pyrus n. (Bot.) A genus of rosaceous trees and shrubs having pomes for fruit. It includes the apple, crab apple, pear, chokeberry, sorb, and mountain ash.
... custom to call the apple Pyrus Malus. This is the name given by the great Linnaeus, with whom the modern accurate naming of plants and animals begins. The nomenclature of plants starts with his "Species Plantarum," 1753. Pyrus is the genus or group comprising the pears and apples, and Linnaeus included the quince; Malus is Latin for the apple-tree. Together the names represent genus and ... — The Apple-Tree - The Open Country Books—No. 1 • L. H. Bailey
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