Orange star, Sun star (Ornithogalum dubium).
Orange star, also known as Sun Star or Snake flower, is a tropical perennial bulbous flowering plant of the family Hyacinthaceae (cold hardy USDA zone 7-10). It is a long blooming plant with beautiful large flowers, yellow to orange or rarely white, often with a green or brown center. This species is found on mountains and flats over a broad area in the Cape Province of South Africa. Flowers in winter or spring.
If you want more information about this flower, just search the plant's Latin (botanical) name on Google: