1	"Nut equally trigonous, with the dorsal angle acute, pale yellow or grey and dull to blackish and shining; style 3-fid"	"Bolboschoenus fluviatilis"
1	"Nut lenticular or unequally trigonous with the dorsal angle obtuse, surface always shining; style 2- or 3-fid"	2
2	"Nut lenticular, straw-coloured to dark golden brown, the surface minutely but obviously reticulate; style 2-fid"	"Bolboschoenus caldwellii"
2	"Nut plano-convex or trigonous, dark red-brown to black, the surface not obviously reticulate; style 2- or 3-fid"	"Bolboschoenus medianus"