Only on sunny mornings the flowers of Yellow Goat's Beard (Tragopogon pratensis) do open.
Here is one with some visitors.
Like other members of the family of Asteraceae, the Yellow Goat's Beard
produces seeds with a fluffy umbrella to be carried away on the wind.
The flowerheads have changed now into fuzzy tennis balls. 
They are so large you can distinguish the small features of each
umbrella. It has a seed for a handle, and the ribs are woven together
with thin, spiderweb-like tissue.