Thrives on soils rich in calcium carbonate. Abundant on plains with creosote bush and white thorn. The flower heads are 1 inch (2.5 cm) wide and have 4 to 6 broad, overlapping, white rays and small, yellow aging to brown disks. The leaves have sharp tips and are small, stiff, grayish green, opposite, and linear in shape. The plants are mounding and look like little shrubs.

Saguaro National Park East
3/21/15

Notes: Abundant in foothills of Rincon and Santa Catalina Mountains.

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