1	"Leaves 2–5 mm wide, length to width ratio 7.5–15, sheath with auricles absent; lamina margin with teeth c. 0.6–0.7 mm long, dorsal surface with 1-many teeth; plants dioecious"	"Najas marina"
1	"Leaves less than l(–3) mm wide, length to width ratio 30–62, sheath with auricles narrowly triangular; lamina margin with teeth up to c. 0.1 mm long, dorsal surface without teeth; plants monoecious"	"Najas tenuifolia"