This report deals with the monocotyledonous plant, Butomus umbellatus L. bearing the common name of Flowering Rush. The author discovered this plant in the hydraulic canal, an arm off the Elkhart River at the edge of the city of Goshen, Elkhart County, Indiana on July 4, 1952. The plants were in full bloom, growing in shallow water along the bank, in pure stands and in some places in association with Sagittaria latifolia, Sparganium androcladum and the Reed-Canary Grass, Phalaris arundinacea. The presence of Butomus was noted in this situation through the past 12 summers. Observations made the past summer of 1963 revealed that these plants were growing at many points along the length of the canal as well as in the main part of the river, both above the source of the canal and below the mouth where the canal returns to the river. The entire distance of river and canal along which colonies of this species were found is over 3 miles. The species seems to be well established here and should be considered a new addition to the flora of Indiana.