Cactus identification?

My mom has been growing this thing in a window pot in her apartment. She has no idea what it is. Obviously it is some sort of cactus. Can anyone identify it?
http://home.houston.rr.com/snaps/cactus.jpg
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Looks like a carrion flower (Stapelia). The flowers smell awful and flies will often lay eggs in the flower. It is a succulent.
On Sun, 17 Oct 2004 12:45:29 GMT, "Bubba"

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Not a cactus but a "fat-plant" .. as said probably Stapelia or related ..
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Obviously not a cactus at all.
Its Orbea variegata, a Stapeliad, a stem succulent member of the Milkweed family from South Africa.

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