Carl Linnaeus Species Plantarum binomial nomenclature stamens ferns stamen reproductive stem
Carl Linnaeus (1707–1778), was a Swedish botanist who spent most of his working life as a professor of natural history. His landmark 1757 book Species Plantarum lays out his system of classification as well as the concept of binomial nomenclature, the latter of which is still used around the world today. He identified 24 classes, based mainly on the number, length and union of the stamens. The first ten classes follow the number of stamens directly (Octandria have 8 stamens etc.), while class eleven has 11–20 stamens and classes twelve and thirteen have 20 stamens; differing only in their point of attachment. The next five classes deal with the length of the stamens and the final five with the nature of the reproductive capability of the plant; where the stamen grows; and if the flower is concealed or exists at all (such as in ferns). This method of classification, despite being artificial, was used extensively for the following seven decades, before being replaced by the system of another botanist.
