Berberis sp
The photographer behind today''s image is Jack Dykinga, who I assume must have done some work for the USDA''s Agricultural Research Service at one time (unless there are two exceptional photographers named Jack Dykinga). Artistic work commissioned by the US government has few restrictions on its reuse, and in this case, the photograph is licensed under the Creative Commons.
As noted on the above-linked page, this is a photograph of an Osmia ribifloris on a species of Berberis. The bee is usually known as a blue orchard bee or, due to its success as a commercial pollinator of blueberry crops, the blueberry bee. In the wild, it is typically a pollinator of Californian manzanitas.
Wikipedia has an intriguing entry on Berberis (or barberry); the write-up for the genus includes details about the use of some species as spices or foods in Asia and South America. Somewhere around five hundred species of barberry are thought to exist, growing in temperate and subtropical regions of most continents except Australia (and, it goes without saying, Antarctica).