A new flower to me that I found on a lake shoreline on Cape Cod:
For the identification, I have to thank Linda (shoreacres.wordpress.com). Linda recently posted another flower in this genus, Eriocaulon, and I saw the similarity. This flower is likely the common E. aquaticum or possibly the rare endemic E. parkeri. The flower is just a few millimeters across. It’s always best to bet it’s the common species – I’ll ask a botanist.