Alfalfa, Lucerne,Medicago sativa,Pea family (Fabaceae)

Found in fields, at roadsides
Seen blooming all summer by roadsides and in yards

This bushy plant with purple flowers is so common that we hardly notice it. Alfalfa is an escapee from cultivation. It has clover-like leaves and grows to 3 feet tall and wide. It is very drought resistant and produces abundant flowers, blooming from late spring through the fall.  Flower color ranges from pale blue to dark purple, but it can be white or yellow. Alfalfa is one of the oldest cultivated plants, and it is used as livestock forage, as a highly nutritious food for humans, and as herbal medicine. It is considered to have the highest nutritive value of all fodder plants. Alfalfa has been used for numerous ailments in traditional folk medicine throughout the ages including menopausal symptoms, arthritis, indigestion, liver disorders, hemorrhoids, bleeding gums, asthma, anemia, high blood pressure, high cholesterol, osteoporosis, diabetes, eczema, constipation and burns. Source.
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If you want to identify a different flower then you might find it useful to check what was blooming this time last year. If you cannot identify a flower from the website send a photo and where you took it to contact@rockymountainsflora.com. Read online for tips.