rosy periwinkle

Although the rosy periwinkle stands only one foot tall, in the world of medicine it's a giant. In the 1950s, scientists figured out how to use chemicals from this plant to treat childhood leukemia and Hodgkin's disease. Before then, most people who got these diseases died. The rosy periwinkle is one of thousands of plants that produce chemicals that can help save human lives.

Image credits: main image, courtesy of James Manhart.