1. Submersed plant with whorled lanceolate leaves and solitary axillary flowers; naturalized in southern US and clogging Florida's waterways
   "Hydrilla is considered one of the world's worst aquatic weeds";
   - Hydrilla verticillata

Derived forms: hydrillas

Type of: aquatic plant, hydrophyte, hydrophytic plant, water plant

Part of: genus Hydrilla

Encyclopedia: Hydrilla