ENPO160809_D012 Published August 11, 2016 at 1600 × 1063 in Photo of the Week – August 11, 2016 Sand bluestem (Andropogon hallii) is sometimes lumped with big bluestem (Andropogon gerardii) and sometimes considered a separate species. I’m not entering that argument. However, sand bluestem (shown here) does tend to have much hairier flowers.