Sparganium erectum, which ssp?

Sparganium erectum, which ssp?

Observation - Sparganium erectum, which ssp?. Description: I collected two seed heads and foolishly didn't keep them separate, so it is just possible two subspecies are present, but the plants were growing next to each other so different ssp. are not likely.

I collected two seed heads and foolishly didn't keep them separate, so it is just possible two subspecies are present, but the plants were growing next to each other so different ssp. are not likely.