What is the topic of paragraph three?

A gigantic, suicidal palm tree

    A gigantic, suicidal palm tree has been discovered in Madagascar, researchers announced today. The palm represents a genus seen nowhere else in the world--and a unique conservation challenge for a nation with a poor environmental track record.

    "This palm really is an amazing discovery," says palm biologist Scott Zona of the Fairchild Tropical Botanic Garden in Coral Gables, Florida. "It adds a completely new branch to the palm family tree, something that happens very rarely." It's a spectacular find, adds research botanist James Miller of the New York Botanical Garden in New York City. "It makes you wonder how much we've already lost."

    Xavier Metz, the French manager of a cashew plantation in remote northwestern Madagascar, found the flowering palm while picnicking with his family 2 years ago. His photos of it eventually made their way to John Dransfield, a palm expert at the Royal Botanic Gardens, Kew, in Richmond, U.K. Dransfield was astonished by the palm's appearance, but he was even more surprised by a study of its DNA: Lab tests showed that the palm was a previously unknown genus and species within a family of palms found primarily in Afghanistan, Thailand, and southern China.

 What is the topic of paragraph three?