Wikipedia
Diuris
Diuris, commonly known as donkey orchids, is a genus of more than sixty species of flowering plants in the orchid family, Orchidaceae and is endemic to Australia apart from one species endemic to Timor. The name "Diuris" refers to the hanging sepals but the common name derives from the ear-like petals common to all species. All have mainly yellow flowers with darker markings and are thought to mimic nectar-producing flowers which open at the same time.