Funny looking seeds of Anemone tomentosa 'Rosbustissima'?

After blooming profusely in early autumn the Anemones have produced an unusual looking seed head. The seeds are tiny and dark about the size of poppy seeds on top of a cottony wool. It would seem that the seeds should be closer to the stem as in other plants but somehow the seeds are coating the top of the cotton balls. I had never seen this before so when the first ones started to form I thought some cotton got caught on a branch.

The other Anemone planted nearby 'Honorine Jobert' is also producing a seedhead but so far just a tightly formed nub and nothing like the tomentosa. Perhaps this is because Honorine Jobert is a hybrid and infertile.

I'll collect the seeds and plant them to see if they are viable.