Noun | 1. | Wolffiella - minute rootless aquatic herbs having flat fronds floating on or below the water surface and bearing 1-2 flowers per frond; America and Africa liliopsid genus, monocot genus - genus of flowering plants having a single cotyledon (embryonic leaf) in the seed bogmat, mud midget, Wolffiella gladiata - having narrow flat sickle-shaped submerged fronds; North America |