Seen in freshwater pond in Bryngarw Country Park
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Those spikey green spheres are the female heads ie fruits!
Many thanks - noted.
Thanks for the comment cicuta58.
I went back to Rose and found that I had completely misunderstood the information about the flower heads and fruits. I had thought that the female heads formed above the male ones, rather than the other way around - must pay closer attention to the descriptions - hence my apparently odd comment about female heads not being present.
Grateful for your feedback, since it made me re-examine what I had thought.
Lat/Lng: 51.5524, -3.5785
OS grid ref: SS906849