tradescantia pallida - three petals and six yellow anthers

While waiting for the light to change on a busy Atlanta street, I saw lots of bees on a patch of tradescantia pallida, also known as purple-heart or purple secretia.  These plants are growing from east facing gaps of a sidewalk wall. 

The bee weight folds the filament at right angle.  Click on the image, it's hard to distinguish between bee's pollen load and the three anthers in her grasp.  Does the recent warm November rain make the filament more flexible? Perhaps these are extra long filaments, I don't know.  In the process of counting petals and anthers I discovered on Wikipedia that this New World plant is part of same genus as my bee friendly plant favorite, spiderwort.