A hybrid between Menzie's Spirea (S. douglasii var. menziesii) and Rosy Spirea (S. densiflora), this spirea is uncommon. Here a large thicket thrives at Mountain Meadows on the northwest side of the Park.

The inflorescence is somewhat pyramidal, but the flowers are pale pink. The leaves are oval and toothed above the midpoint. They are smooth, like Menzie's Spirea.