Weather: Partly Sunny, Windy. Time approximately 2:00PM EST
I believe this is Black Huckleberry affected by Huckleberry Witches Broom Rust.
One inflorescence still with a few petals on May 18 2022. Growing in sandplain with dominants Pinus rigida and Quercus ilicifolia. Photo #5 is an extreme closeup of a petal with pollen-bearing morphology (although withering at this date)
Occurring with Equisetum hyemale. Hybrid E. xmackaii was sought but not observed.