Here are some other pictures. Sorry I was thinking about this late last night and posted a message without many pictures b/c it was too dark outside. I just took some other pictures. I couldn't get a picture of the flowers b/c there were only a couple this year way at the top of the shrubs (but tons all over last year). We had several really late frosts--may that could have inhibited some of the flowers this year?? We had multiple shrubs with damage this spring. There is a picture of the dried flower remnant still on the shrub from last year though.

Is it some sort of indigofera?

Senna pendula or corymbosa are the most common types in the South.

The above image is one from google streetview. Here is another angle: There appears to be several in a row, variously pruned. A second type of shrub is in the row also, possibly boxwood. The plant of the first image is on the left here.