Aristolochia microstoma finds love by smelling like death. Coffin flies can’t resist.
IT WAS THE butterflies that tipped them off. Thomas Rupp, a PhD student in ecology at the Paris-Lodron University of Salzburg, was walking through a mountain forest with his teammates near Athens, Greece, when he saw them: the insects that, when in caterpillar form, feed on a special kind of plant called Aristolochia microstoma. “Wherever I saw this butterfly flying,” Rupp says, “I knew that there must be some Aristolochia plants around.”
Rupp crouched down to find the plant’s unusual flowers lying hidden among rocks and leaves. They are a dark merlot red, and they look like an inflated bulb connected to a narrow tube tipped by a small pore called a stoma. The whole thing looks a lot like the entry to an intestinal tract. It’s not. It’s even weirder.