Genus - Leucanthemum
The genus name is derived from the greek roots leucos meaning white and anthos meaning flower. There are at least 41 species currently identified in the genus. Most spread through both rhizomes and seed. Plant heights greatly vary with some being groundcovers while others can reach 6' tall.
By far the most used varieties in the U.S. are cultivars of Leucanthemum x superbum, commonly called shasta daisies. The name shasta daisy is derived from their development in the 1890's by Luther Burbank in northern California near Mount Shasta.