The mountain shrub Spiraea densiflora has several common names, including mountain spiraea, dense-flowered spiraea, rosy spiraea, and subalpine spiraea. It is found on the west coast of North America from California to British Columbia. It grows at elevations between 2,000 and 11,000 feet on inland mountain ranges.
It is a woody shrub rarely reaching a meter in height. It has light green toothed leaves which turn yellow as cold weather approaches. The plant bears fragrant, fuzzy pom-pons of bright rosy pink flowers in the summer. The fruit is a tiny dry pod, no more than one eighth of an inch in length.
The plant is adapted to cold, moist, rocky slopes.