Heliomeris longifolia is a North American species of flowering plants in the sunflower family called the Longleaf false goldeneye. It is widespread across much of Mexico from Chihuahua and Sonora south to Chiapas, and found also in the southwestern United States from Nevada to western Texas.Heliomeris longifolia is an annual herb up to 15 cm (5.9 in) tall, with a large taproot. Leaves are up to 16 cm (6.3 in) long, with hairs along the edges.