achillea genus -- Aster subfamily 3.1

​Aster 3.1 (Genus A to F) -- Aster 3.2 (Genus G to O) -- Aster 3.3 (Genus P to R) -- Aster 3.4 (Genus S to Z)  

fernleaf yarrow (Achillea filipendulina) -- in August -- Prospect Ponds/CSU ELC, Fort Collins, CO