Description - from Wikipedia

Moraea flaccida, commonly known as the one-leaf Cape tulip, is a bulb native to South Africa, including in Fynbos habitats. Despite its common name, this species is not a tulip (Liliaceae) but rather belongs to the family Iridaceae.
It has become a noxious weed in farmland in southern Australia, including parts of Western Australia, Victoria and South Australia.

References

Media related to Moraea flaccida at Wikimedia Commons