Wild Bee (Anthophila, Hymenoptera) on unknown flower in the garden - so blue it's black

Here is a tiny Wild Bee (Anthophila aka Apoidae, order Hymenoptera) on a flower in the garden. I don't know what this garden flower is, but it has flowers so blue/violet/indigo that they are nearly black. My camera can't capture them. (San Marcos Pass, 28 July 2012)

 

I believe the flowers are Blue Throatwort (Trachelium caerulum) in the Campanulaceae. "Purple Haze" would be a good name for them. Thanks for again the ID Jeff - it took me a day to remember!

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Taken on July 28, 2012