This summer I will be mapping willows (streamside shrubs) on Yellowstone's northern range (the area occupied by Yellowstone's northern elk herd in the winter). Basically, my assistant and I get paid to hike all over Yellowstone and use gps units to mark the willow thickets that we find. Then we measure how tall they are and record a few other pieces of data.
The hard part will be identifying the species of each thicket. Willows all look very similar to each other and they hybridize. So… Continue