I took this photo in January at Zion. I asked the ranger what it was and she thought it might be rabbit brush, but wasn't sure. I am not familiar with this plant, so hard for me to figure out. It was situated near the river with lots of others, so some sort of riparian plant I'm guessing. Shrub, looks to be at the tail end of going to seed, starting to green up a bit on the stems. On further research, correct botanical name might be Ericamerea nauseosus, which is also listed as rabbitbrush (one word, apparently, not two).