This is the Hemerocallis fulva. Hemerocallis fulva is from the Hemerocallidaceae family. It is a deciduous perennial perianth with dark orange to yellow flowers. The flowers consist of six tepals (This flower has 3 petals and 3 sepals known collectively as 6 tepals.)
As the common name suggests, Daylilies only flower for one day, however the flowering season lasts several weeks from July to August due to the high production of flowers.
As these plants are monocotyledonous plants, the leaves have parallel veins and are long and narrow with a light green colouration.

The image on the bottom left is a variety of the Hemerocallis fulva, called the Hemerocalliss fulva 'Flore Pleno'. The main difference between the two is that the Hemereocallis fulva 'Flore Pleno' has a double headed flower with a red throat unlike the singled flowered Hemerocallis fulva with a yellow throat.

These plants are edible, and are mainly used in China and Korea.
The leaves, young shoots and flowers can all be cooked and the flowers can also be eaten raw. These plants are also used for medical purposes such as: birth control, blood purifier, jaundice, constipation and pneumonia and many more.