Helenium microcephalum is a North American perennial plant in the Sunflower Family, commonly known as smallhead sneezeweed. It is found in the southwestern and south-central United States and northern Mexico.Helenium microcephalum is an annual herb up to 120 cm (4 feet) tall, with wings running down the sides of the stems. Leaves are narrow and elliptical. One plant can have 300 or more small spherical or egg-shaped flower heads, generally no more than 12 mm (half an inch) in diameter.