"...so convincing that male wasps will mate with it to the point of ejaculation."
After reading that in Harper's Magazine ("Findings" section, Sept '08), I Googled the relevant terms and found that this has been known for a century, and there's an abundance of such reports, most of them originating from Australia.
Some orchids can imitate the olfactory cues used by males to locate females, including producing pollinator-specific sex pheromones. As the pollinator approaches the orchid, he is again deceived by the coloration or shape of the blossom.
The original research was performed on Australian tongue orchids (Cryptostylis species). Curious to know what they looked like, I searched Google images and found the embedded photo above at the link below.
Remember, to a male wasp, these orchids look and smell like female wasps. What they look like to you is not relevant here.
From the Upcoming , submitted by ueue .