(from δις, twice, and ἀνή, a man), the name of the second clas in Linnaeus's sexual system, consisting of hermaphrodite plants: which, as the name imports, have flowers with two stamina or male organs.

The orders in this clas are three, derived from the number of styles or female parts. Most plants with two stamina have one style; as jessamine, lilac, privet, veronica, and baldart alaternus: vernal grass has two styles; pepper, three.