Iris versicolor aka Purple Iris

Iris versicolor, commonly known as the blue flag, harlequin blueflag, larger blue flag, northern blue flag, and poison flag, is a species of Iris native to North America. It can be found in the Eastern United States and Eastern Canada, particularly in sedge meadows, marshes, and along streambanks and shores. The plant features strap-like mid green leaves and produces pink to lilac-mauve and white flowers with purple veining and a yellow center. These open flowers bloom from May to June and create a visually appealing display. The specific epithet "versicolor" reflects the plant's various colors. In the Iris flower data set, Iris versicolor is one of the three species used as an example of linear discriminant analysis in Ronald Fisher's 1936 paper. Although it is more commonly found in the wild, this clump-forming perennial would be a great addition to home gardens, especially near water features. Its bluish-green, sword-shaped leaves and stalks adorned with three to five violet-blue flowers make it a striking choice. The flowers can reach up to 4 inches in diameter, further enhancing their visual impact. Iris versicolor is suitable for bog gardens, ponds, lakes, and streams.