About Calycoseris wrightii A.Gray
Calycoseris wrightii A.Gray, commonly known as white tackstem, is an annual spring wildflower. It is one of two species in the genus Calycoseris; the other species is C. parryi, yellow tackstem. Both species belong to the family Asteraceae. White tackstem is distributed in the southwestern United States and northwestern Mexico. Its confirmed range within this region includes California, Nevada, southwestern Utah's Washington County, New Mexico, Arizona, western Texas's El Paso County, northern Baja California, and Sonora, per the United States Department of Agriculture. This plant produces white daisy-like flower heads that can reach over 5 cm (2.0 inches) across. When it grows supported by other plants, it can reach over 45 cm (18 inches) in height. It has a clear distinguishing feature: the closed outer surface of its ray florets bears two linear purple stripes, which are fine reddish veins 2 to 3 cm (1 inch) long on the abaxial side. This spring wildflower grows in desert regions, where it becomes abundant after winter rains. It occurs at elevations up to 1,220 m (4000 ft).
