Orange Day Lily (Orange Daylily)
A perennial lily with stout, fleshy roots, straplike leaves, and tall flower stalks that don't branch below the inflorescence. Flowers terminal on branched stalks, erect, with 3 sepals and 3 petals of dull orange color, the sepals slightly smaller, spreading, to 3½ inches long. Each flower lasts only one day. Blooms May-August. Leaves basal, narrow, straplike, hairless, somewhat folded lengthwise, to about 2 feet long.
Similar species: Yellow day lily (H. lilioasphodelus) is also commonly cultivated as an ornamental in Missouri, but so far it has not become established outside of cultivation in the state.