liliopsid family, monocot family - family of flowering plants having a single cotyledon (embryonic leaf) in the seed

Alismales, Naiadales, order Alismales, order Naiadales - an order of aquatic monocotyledonous herbaceous plants

pondweed - any of several submerged or floating freshwater perennial aquatic weeds belonging to the family Potamogetonaceae

genus Potamogeton, Potamogeton - a large genus of aquatic herbs found in quiet waters in temperate regions; leaves usually float on the water

genus Groenlandia, Groenlandia - a monocotyledonous genus of the family Potamogetonaceae

genus Zostera, Zostera - (or in some classifications family Zosteraceae) small genus of widely distributed marine plants