This pretty, low-lying flower with large yellow blossoms is a member of the Evening Primrose Family (Onagraceae), and is Howard's Evening Primrose (Oenothera howardii). 
Like other evening primroses, the flowers open for just one evening, when they are pollinated by moths. Then the flower wilts away, its job done.
This is a good plant for xeriscaping. For more information about Howard's evening primrose, click here. 
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