Melampodium leucanthum

Melampodium leucanthum, the blackfoot daisy or rock daisy, is a low-growing perennial subshrub in the family Asteraceae, native to limestone soils of the Chihuahuan and adjacent deserts of the southwestern United States and northern Mexico. Plants form rounded mounds 15 to 30 centimetres tall and somewhat broader, with many slender wiry stems arising from a woody crown. The leaves are opposite, narrowly linear to oblanceolate, 2 to 4 centimetres long, with entire or minutely toothed margins, often greyish-green and slightly rough to the touch. Flower heads are solitary at the stem tips, each composed of eight to ten broad white ray florets surrounding a small yellow disc — heads about 2 to 3 centimetres across. Heads are produced abundantly from spring through autumn, especially after rains. The species is widely cultivated in xeric gardens for its long bloom season and drought tolerance.