This introduced perennial plant consists of a rosette of basal leaves and flowering stalks about 3-6' tall. The basal leaves are linear with parallel venation and hairless, tapering gradually to a sword-like point. They have a tendency to bend down and outward around the middle, and are somewhat floppy in appearance. From the center of the rosette, there develops one or more stout flowering stalks that are held erect and are usually much taller than the leaves. Each stalk is hairless and largely naked, except for a few green bracts along its length. It is largely unbranched, except near the apex, where there is panicle consisting of a few small clusters of flowers. The flowers are orange and quite large, spanning individually about 3½" across. They are held semi-erect or horizontally on the their stalks, rather than hanging downward. Each flower consists of 6 orange tepals (3 petals and 3 sepals that are similar in appearance) that are united at the base, but spread outward and backward toward their tips. The 3 inner tepals are somewhat broader than the 3 outer tepals. The margins of each tepal are rolled. The throat of the flower is yellow, around which there is a band of red, while the remainder of the flower is some shade of orange. Exerted from its center, there are 6 long stamens and a single style. The buds of the flowers are green to greenish orange, oblong, and up to 3" long. The blooming period occurs during mid-summer and lasts about a month. Each flower lasts only a single day, hence the common name. The seed capsules, if any are produced, are 3-celled and contain rows of black seeds. However, these seeds are infertile because the Orange Day Lily is a sterile hybrid. The root system consists of fleshy fibrous roots and rhizomes. This plant often forms vegetative clumps of plants that exclude other species.