(τετράνδρια, "four," and ἄνδρος, "a man or husband"); the name of the fourth class in Linnaeus's Sexual System, consisting of plants with hermaphrodite flowers, which have four stamens or male organs that are of equal length. In this last circumstance confits the main difference, according to Linnaeus, between the plants of the class in question and those of the 14th class didynamia, in which the four stamens are of unequal length, two of them being long, and two short.—The orders of this numerous class are three, founded upon the number of styles or female organs. Scabious, teazel, barren-wort, the flary plants of Ray, and the greater number of genera in this class, have one style; dodder and hyscicum have two; holly and a few others have four.