The new species, collected on two small islands off Madagascar, brings to about 170 the number of species in the genus Amorphophallus, which is Greek for “misshapen penis” because of the shape of the plants’ flower-covered shaft, called the inflorescence or the spadix, says Greg Wahlert, a postdoctoral researcher in biology.
Cameron McIntire, University of Utah.
Close-up of the reddish-purplish, leafy "spathe" surrounding the central "spadix" of the newly discovered plant species Amorphophallus perrieri, which grows to 5 feet tall, one-fourth the height of its more famous relative, the "corpse flower" or Amorphophallus titanum. While the spadix sometimes is referred to as the plant's "flower," in fact the lower part of the spadix, hidden by the spathe, is covered by hundreds of tiny flowers, each only a fraction of an inch big.
The 4.5-foot-tall plant, Amorphophallus perrieri, began reeking Friday, Feb. 3 as it approached the peak of its bloom in a campus greenhouse. A day later, Wahlert began cutting down the plant in stages so the spadix, the surrounding leafy spathe and other parts could be pressed, mounted and submitted to the National Museum of Natural History in Paris as part of the process of designating the plant a new species.
That won’t be official until about a year from now after Wahlert publishes a scientific paper formally describing the species, which can grow to 5 feet high, and how it differs from relatives in the genus, including Amorphophallus titanum – also known as the “corpse plant,” “corpse flower” and “titan arum” – which grows to 20 feet high.
After Wahlert first collected specimens of the new plant in 2006 and 2007 and discovered it was a new species, he found the Paris museum’s herbarium held a dried specimen collected from one of the same islands by French botanist-geologist Joseph Marie Henri Perrier de la Bâthie (1873-1958), who didn’t realize it was a new species. So Wahlert is naming it for Perrier.
“Perrier collected it in 1932, and it sat in the museum until we dug it up and compared it to the other specimens and the plants that I had collected,” Wahlert says. “Perrier spent years working on scores of other plant groups [and describing hundreds of other new species] and just never got around to it.”
The corpse flower smells like rotting meat to attract the flies and beetles that pollinate it. Wahlert had expected the new species would smell like cheese, which it did briefly when it began blooming Feb. 3. But the odor soon grew worse – much worse – and more like its giant relative.
“I smelled rotting roadkill out in the sun reeking,” says University of Utah biology Professor Lynn Bohs, in whose lab Wahlert works. “There’s also a note of public restroom – a Porta Potty smell.”
Wahlert added: “I would say carrion and feces. When you get right up to it, it’s really foul and disgusting.”
Another Utah researcher collected volatile gases emitted by the plant “and will identify the components of the smell,” Wahlert says. Only a small group of Amorphophallus species have been tested for odors, but the known aromas range from rotting meat to anise, cheese, dung, fish, urine, spice and chocolate, he adds.
Two weeks before the plant began to bloom, “it was just a little bud sticking out of the dirt,” he says. When it bloomed, the stalk was almost 4 feet tall and the inflorescence or spadix was about 10 inches long. It was yellow, with pollen on the top part. The lower part, hidden by the reddish, leafy spathe, was covered by hundreds of tiny flowers, each a fraction of an inch wide. (Sometimes the entire spadix is referred to informally as the flower.)
“They are just so rude – their appearance and smell,” Bohs says. “Everybody I’ve talked to says they almost started puking when they smelled it. It’s horrid.”
In the Same Family as Philodendrons and Skunk Cabbage
Some thought the plants’ suggestive genus name was horrid. In 2008, Sir David Attenborough said he invented the name “titan arum” for the corpse flower for his BBC series “The Private Life of Plants” because he thought it would be inappropria