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Day lily stems/flower stalks are 3-6' tall and hairless; 5-9 flowers arise on a small panicle. The flowers are erect, orange with a yellowish center but without spots, large (3-4" wide), with six tepals (petals and similar sepals) with a white medial line and tips that curl backwards. The margins of the tepals are rolled inwards. The flowers have a single straight style and six stamens that curve markedly upwards. The flowers last only a single day. (Thus, the common name.) The seedpods are six-lobed, egg-shaped, and internally divided into three compartments, but the black seeds are inviable; day lilies are a sterile triploid hybrid that has escaped cultivation and reproduces only vegetatively. Day lily is considered invasive and spreads easily. The flowers can be cooked and eaten like squash blossoms and the leaves and tubers are edible when young, but day lilies are extremely toxic to cats and, to a lesser degree, dogs. Day lily is easily distinguished from the other common lily in Jackson Park, Michigan lilies, by the lack of spots on flowers and leaves that are basal and sword-like rather than in whorls around the stem and a horizontal orientation rather than pointing down. According to Flora of North America, day lilies were imported from Asia to Europe in the seventeenth century and to North America in the nineteenth century.

Hemerocallis

Hemerocallis fulva

day lily [Blooms: Jun-Jul]