The whole flower head is an umbel; the individual clusters of flowers in the umbel are umbellets. They turn white as they open.
Hardhack. One of my favourite dried flowers. Dries to a quiet brownish mauve colour. Grows in wet ground.
Canada Thistle. Grows everywhere, but likes good garden soil.
The countdown begins: two more days before Rock Flipping Day. These, underwater at Crescent Beach, would be interesting.
Rocks and fractured light.