Calycoseris wrightii

Calycoseris wrightii, commonly known as white tackstem, is an annual spring wildflower, one of two species in the genus "Calycoseris"; the other species is "C. parryi", the Yellow tack-stem. They are part of the sunflower family.
White tackstem is found in the southwestern United States and northwestern Mexico in California, Nevada, southwestern Utah (Washington County), New Mexico, Arizona, northern Baja California, Sonora, western Texas (El Paso County).United States Department of Agriculture .
"Calycoseris wrightii" is a white daisy-like flower up to more than across; when it grows supported amongst other plants it can be more than 45 cm (18 inches) tall. It has one easy distinguishing feature: the closed outside of the ray florets contain two linear purple stripes (fine reddish veins abaxially – 2 to 3 cm (1 in)). It is a spring wildflower found in the desert regions and is plentiful after winter rains. It grows up to 4000 ft (1,220 m) elevation.