Leucanthemum vulgare Lam.
Leucanthemum leucanthemum (L.) Rydb. nom. inval.
Chrysanthemum leucanthemum L.
Chrysanthemum leucanthemum L. var. boecheri B. Boivin
Chrysanthemum leucanthemum L. var. pinnatifidum Lecoq & Lamotte
Leucanthemum vulgare Lam. var. pinnatifidum (Lecoq & Lamotte) Moldenke
Leucanthemum leucanthemum (L.) Rydb.
Oxeye daisy, ox-eye daisy
The oxeye daisy is widespread throughout North America, but not a native—it comes from Europe and Asia.
Identification: These daisies are 12-36" (30-91 cm) high, with heavily lobed dark green leaves. Lower leaves are up to 6" (15 cm) long, narrow, vaguely oval, with irregular lobes. Upper leaves are small and narrow, attached directly to the stem. Like other members of the aster family, daisies are composite flowers, with a yellow central disc composed of disc flowers surrounded by about 20 white “petals,” actually ray flowers. Typically there is a single flowers per stem, 1-2" (2.5-5 cm) around. The central disc is ¼-½" (6.3-12 mm) around, and depressed in the middle. They are common in fields and along roadsides. In some places they are planted intentionally; in others, borderline invasive.
Leucanthemum vulgare at Illinois Wildflowers
Leucanthemum vulgare on Wikipedia
Leucanthemum vulgare at the Washington State Noxious Weed Control Board
Leucanthemum vulgare on Plants for a Future, a resource and information centre for edible and otherwise useful plants
Leucanthemum vulgare on SEINet—the Southwest Environmental Information Network
Leucanthemum vulgare description by Thomas H. Kent, last updated 25 May 2020.