Hawai'i is home to some of the rarest plants in the world, many of them now threatened by extinction. Despite a benign and nurturing climate, native species are declining almost everywhere in the Islands. Human-introduced pests, the spread of competing alien plants, wildfires, urban and agricultural development, and other disturbances of modern life are eliminating native species at an alarming pace. In fact, 38 percent of all plants on the U.S...