Houseplant with Quite Unusual Flowers.
by Christopher Struett
(San Francisco, CA, USA)
The flower is about 2 inches in diameter.
Drought Smart Plants reply: Hi Christopher,
That is an amazing flower! It looks like you have a Stapelia, known as the carrion flower, for it's deathlike scent, meant to attract the flies to pollinate it.
See more about them here: Stapelia. Other related plants such as Huernia and Orbea are also known as Carrion Plant, for the same distinctive odour.
Happy Succulent Gardening!