The leaves, which show great variety in size and form, are generally broad and net-veined, but in sweet-flag (Acorus Calamus) are long and narrow with parallel veins.
The sweet-flag Acorus Calamus, which occurs apparently wild in England in ditches, ponds, &c., is supposed to have been introduced.
In the ditches and pools common yellow and white water-lilies are seen, as well as water-soldier (Stratiotes aloides), great and lesser reed-mace, sweet flag and bur-reed.
