One White Flower

Jeffersonia diphylla growing at the base of a Witch Hazel.  
Wiki tells us ....
Jeffersonia which is also known as twinleaf or rheumatism root, is a small genus of herbaceous perennial plants in the family Berberidacae. They are uncommon spring wildflowers, which grow in limestone soils of rich deciduous forest. Jeffersonia was named for United States President Thomas Jefferson, by his contemporary Benjamin Smith Barton.

It's a lucky blip - the flowers are very short-lived, I often miss them.