naiadales

from The Century Dictionary and Cyclopedia

• An order of monocotyledonous plants, consisting of aquatic or marsh herbs with unisexual flowers, the parts of which are usually unequal in number. It embraces 7 families of which the Naiadaceæ, Potamogetonaceæ, Alismaceæ, and Yallisneriaceæ are the chief.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• n. an order of aquatic monocotyledonous herbaceous plants