What plant is this?
Hi ! Thank you for the pictures. The common name for that plant is Rabbitbrush (Chrysothamnus sp.). There are at least 12 native species occurring in the west, with at least three species found here in Colorado, with the most common species found around here in northern Colorado being Chrysothamnus nauseosus, or gray rabbitbrush. Another (non-standard) name is rubber rabbitbrush. It is in the Asteraceae (Sunflower) family.