IRIS PSEUDOACORUS L.
Coltellaccio 50-100 cm tall plant, hygrophilous. Large oblique rhizome. Cylindrical stem a little compressed, branchy. Leaves form 1 to 3 cm wide, as long as the stem. Odorless large yellow flowers. Widely oval external tepals, tinged with red at the base, very small and narrow interiors. Flower. : IV - VI. It grows in the canals, ditches, marshes.