Rush pussytoes has two things going for it: beautiful silver leaves that are fairly long (for a pussytoes), and a fondness for barren dry sunny slopes. Soft white catkin-like flowers bloom in the spring. 
 
This species is similar to tall pussytoes, but prefers drier growing conditions and is less shade tolerant. While all pussytoes spread to form colonies, this species forms only very loose mats, making it extra suitable to interplanting with other species. Plant in well-drained soil, or even a rock garden or retaining wall. 
 
I don't know why it's called 'Rush' (probably something nit-picky and botanical), but I like to think it's named for the rock band. Regardless, try planting this rock star with jacob's ladder, stonecrop, rock-loving sandwort, and alberta penstemon.