Clementsia rhodantha (Rose Crown, Queen's Crown)
Crassulaceae (Stonecrop Family)

Subalpine, alpine. Meadows, tundra, wetlands. Summer.

"Rhodantha" is Greek for "rose flower".  "Clementsia" is for 20th century ecologist Frederick Clements who was, according to William A. Weber, the "originator of [the] plant succession concept".  The plant was first collected for science by Charles Parry in Colorado in 1861 and was named Sedum rhodanthum by Asa Gray in 1862.  Rose renamed the plant Clementsia rhodantha in 1903.  Linnaeus named the Sedum genus in 1753.