Urchin flower?

 

Doesn't this flower look like a tiny purple sea urchin?

Here's a zoomed-out view:

 

This is an arrow-grass (Triglochin sp.), a species that grows in our local salt marshes.  I didn't have much time, and I was so focused on the flowers that I didn't confirm which species of arrow-grass, so I'll have to double-check and report back. 

P.S.  I showed Seaside Arrow-grass (Triglochin maritima) in flower last year — see "Sparkling, frilly edges" on 26 June 2017.