As the saying goes, the devil is in the details. Last year, Big Bend National Park volunteer Debra Manley and park interpretive operations supervisor Cathy Hoyt were on a hike in a northern area of the preserve when something caught Manley’s eye: tiny clusters of leaves covered with fine, white hairs, barely discernible against the desert gravel. Few of the specimens were larger than a quarter, and the only things distinguishing the plants from the myriad of other fuzzy locals were the strange and delicate flowers studding their centers. Had Manley arrived a few days earlier or later, they might not have been visible at all. It might seem like a minor miracle that anyone noticed them, if you didn’t know about the science arm of…