didynamia

Updated: June 25, 2025

XII. TWENTY MALES, Icosandria. XIII. MANY MALES, Polyandria. In the next two Classes, not only the number of stamens are to be observed, but the reciprocal proportions in respect to height. XIV. TWO POWERS, Didynamia. XV. FOUR POWERS, Tetradynamia.

Erasmus Darwin - The Botanic Garden. Part II.: Containing the Loves of the Plants. a Poem.: With Philosophical Notes.

The term and its antonym were maintained by Linnaeus with the same sense, but with restricted application, in the names of the orders of his class Didynamia. Its use with any approach to its modern scope only became possible after Robert Brown had established in 1827 the existence of truly naked seeds in the Cycadeae and Coniferae, entitling them to be correctly called Gymnosperms.

Various - Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1