Diuris corymbosa

Diuris corymbosa, commonly called common donkey orchid or wallflower orchid, is a species of orchid which is endemic to the south-west of Western Australia. It is similar to the purple pansy orchid (Diuris longifolia), but its flowers are yellow rather than purple or mauve, and it flowers earlier in the year. It also resembles the winter donkey orchid (Diuris brumalis) but flowers later than that species. It is one of the most common orchid species in the Perth area, often forming extensive colonies and usually having numerous flowers on the one spike....read more on Wikipedia.