Spring wildflowers may face challenges in a warming climate. That’s according to researchers who combined their findings with historical observations collected by philosopher and author Henry David Thoreau. Conservation biologists Caitlin McDonough MacKenzie of the University of Maine and Richard Primack of Boston University presented Thoreau’s scientific observations from the 1850s in Concord, Massachusetts to read more Botanists, with help from Thoreau, find climate change puts spring wildflowers in the shade