Phacelia campanularia - Desert Bluebells

Annual wildflower to 1.5 feet. Scallop-shaped leaves with brilliant blue, bell-shaped flowers spring into summer. Great for butterflies, bees, and song birds. Good container plant. Low water. Prefers fast-draining soils. Hardy to 10°F. 

Photo Credit: NPS / Emily Hassell

https://www.flickr.com/photos/joshuatreenp/49825691328/