carrion flower

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of several North American plants of the genus Smilax, especially S. herbacea, an herbaceous tendril-bearing vine having clusters of small greenish flowers with the odor of decaying flesh.
• noun Any of various plants having flowers that emit a foul odor, especially stapelia.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun any of various plants of the genus Stapelia having succulent leafless toothed stems resembling cacti and large foul-smelling (often star-shaped) flowers