This section is from the book "The Gardener's Monthly And Horticulturist V18", by Thomas Meehan. See also: Four-Season Harvest: Organic Vegetables from Your Home Garden All Year Long.
A correspondent calls our attention to the following from Sachs' Text book:
Mr. Sachs says: "According as the union takes place between (1) different varieties of one species - between (2) different species of one genus, or between (3) two species belonging to different genera - the resulting hybrid may be termed a variety-hybrid, species-hybrid, or genus-hybrid. When a hybrid is made to unite with one of its parent forms or with another parent form, or with a hybrid of different origin, the product is termed (4) a derivation-hybrid."
As a matter of scientific precision, and this in a work intended to go the bottom of things, like this of Sachs', is of some consideration, the terms may do; but for every day use we prefer the common term "cross" when a mixture of varieties is intended. The Albany seedling and the Hovey seedling are varieties of one species of strawberry, and the progeny of the two we should say was the result of a "cross." Horticulturists at least would understand us better than if we said "hybrid." How far we should carry this term "\cross," and where we should drop it and take up "hybrid," would depend on the idea we formed of "species." What is a good species to one botanist is simply a variety to another, and while there is this room for doubt there can be no rule that shall be infallible in the use of the terms.