Agoseris grandiflora is a North American species of flowering plant in the family Asteraceae known by the common names California dandelion, bigflower agoseris, and grassland agoseris.
[2] The plant is native to western North America from British Columbia to California to Utah, where it grows in many habitat types.
[3][4] Agoseris grandiflora is a perennial herb producing a basal patch of leaves of various shapes reaching maximum lengths of 50 centimeters.
[2] The upright part of the plant is actually the peduncle of the inflorescence, which can approach a meter in height.
[2] The flower head at the top is up to 4 centimeters wide and lined with reddish or purplish green phyllaries with curling tips.