Another Arrowhead Arrowhead

This late-blooming Arrowhead was found on a floating mat at the end of September. It belongs to the water-plantain family.

It looks as if this is the Grassy, or Grass-leaved, Arrowhead, Sagittaria graminea, which is the Arrowhead that doesn't have arrowhead-shaped leaves! This one can sometimes be referred to as the Slender Arrowhead.

So delicate, with papery thin petals.