Oxeye daisy is a rhizomatous perennial 2-10 dm tall. The plant is glabrous
to slightly hairy. The leaves become progressively reduced upward. The
lower leaves are oblanceolate to narrowly obovate, 4-12 cm long with crenate
or lobed margins; the upper leaves are sessile with margins becoming toothed
to almost entire. The inflorescence, a head, is usually solitary at the
end of a branch. The involucral bracts are narrow with a narrow dark brown
margin. Ray flowers are white with 15-30 rays in a single whorl. The fruit
is a 10-ribbed achene. Pappus absent.
Oxeye daisy spreads vegetatively by rhizomes or from seeds. It invades
fields, waste places, and roadsides.
Oxeye daisy is widely planted and easily escapes cultivation. It is an
invasive exotic that can outcompete and displace native species.