Achillea Clavennae Flowers
Achillea clavennae flowers have white heads and grow in a convex cluster. The outermost flowers on the plant are the first to open. These flowers grow well in the spring and summer.
GalleriesFlowers and Shrubs: A
Nicholson, George The Illustrated Dictionary of Gardening, Div. VI (London, England: L. Upcott Gill, 1884)