I have spent many hours cleaning these seeds and have really many of them to offer for US$4 P&P. The germination rate is very high and I will send you 30 seeds (this will allow you to share seedlings). This Potentilla should be one of the hardiest plants ever and does come true from seeds (not recommended for zones higher than USDA 9). The picture of the single flower is from the mother plant (daughter of the original plant obtained from seeds) and the multiple flowers are my first year seedlings of 3rd generation seeds (neglected in containers slightly larger the size of an individual yoghurt cup), so you can see even the third generation comes true from seeds.
They are great bloomers and the only problem I have had are .... rabbits!
I will dispatch seeds in January after the rush is over (there is no PO in my area).
T-mail me your address and I will provide you my PayPal account.