Egeria densa	Egeria najas	Elodea callitrichoides	Elodea canadensis	Elodea nuttallii	Hydrilla verticillata	Lagarosiphon major
leaves in whorls of (3)4-6	leaves in whorls of 4-6	leaves in whorls of 3	leaves in whorls of 3	leaves in whorls of 3	leaves in whorls of (4-)5(-8)	leaves alternate
leaf tip blunt, margin minutely toothed leaf width 3-5 mm	leaf tip acute, margin conspicuously toothed leaf width 2,5 mm	leaf tip acute, margin minutely toothed leaf width 2,5 mm	leaf tip blunt, margin minutely toothed leaf width 2-4 mm	leaf tip acute, margin minutely toothed leaf width <2 mm	leaf tip acute, margin conspicuously toothed leaf width 2-4 mm	leaf tip acute, margin minutely toothed leaf width 1-3 mm
white petals 8-11 mm	white petals 7 mm	leaves recurved	leaves stiff	leaves twisted and mostly recurved	leaves not recurved, flexible	leaves strongly recurved