Leucanthemum vulgare

Leucanthemum vulgare, commonly called the oxeye daisy, dog daisy or marguerite, is a perennial herb in the daisy family Asteraceae, formally described in 1778 by Jean-Baptiste Lamarck. Native to Europe and temperate Asia and since introduced to North America, Australia and New Zealand, it grows to about 80 centimeters from creeping underground rhizomes, with toothed basal leaves 4 to 15 centimeters long that shrink up the stem, and composite flower heads 2 to 7.5 centimeters wide bearing 15 to 40 white ray petals around a yellow disc, blooming from May to October. Its seeds lack the hair-like pappus common to many daisies, remain viable for nearly forty years, and a single mature plant can produce up to 26,000 seeds, spread by animals, vehicles and water. It is now considered invasive in more than forty countries and is the national flower of both Denmark and Latvia.