(from δωδεκα, twelve, and ανά, a man); the name of the eleventh class in Linnæus's sexual system, consisting of plants with hermaphrodite flowers, that according to the title, have twelve stamens or male organs. This class however, is not limited with respect to the number of stamens. Many genera have sixteen, eighteen, and even nineteen stamens; the essential character seems to be, that, in the class in question, the stamens, however numerous, are inserted into the receptacle; whereas in the next class, icelandia, which is as little determined in point of number as the present, they are attached to the inside of the calyx or flower-cup.

The orders in this class, which are six, are founded upon the number of the styles, or female organs. A-farabacca, mangoflan, florax, purple loofefluffe, wild Syrian rue, and purflain, have only one style; agrimony and heliocarpus have two; burning thorny plant, and bastard rocket, three; glinus, five; illicium, eight; and house leek, twelve.