The longleaf false goldeneye (Heliomeris longifolia) belongs to Asteraceae (the Aster family). It is an annual herb that is native to the southwestern United States from Nevada to western Texas, and much of Mexico. This herb grows in deserts, uplands, mountains, and up to a height of 15 cm. The leaves are lance-linear to linear, up to 16 cm long, with hairs along the edges. The yellow flower-heads bloom atop of stems from June to October. The each head has 12-14 ray flowers surrounding 50 or more tiny disc flowers.