Tilia petiolaris

in Plants
I have been looking for Tilia petiolaris seeds for MONTHS and it seems virtually impossible to find them. I am from ohio and I recently did an internship in the U. K. I fell in love with this tree and have been searching for these seeds without any luck at all. Can anyone tell me where I can acquire these seeds from? I have contacted almost every online nursery and seed store I have come across. Please help!
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I know this as Tilia tomentosa 'Petiolaris', which suggests a cultivar to me and maybe grafting needed, but not a plant I know first hand.
I had a look at the RHS website and it seems to have even more synonyms,
https://www.rhs.org.uk/Plants/18238/i-Tilia-tomentosa-i-Petiolaris/Details
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weeping trees rarely (if ever) seed to weeping trees, the weepyness is a sport and reproduced by grafting
In the sticks near Peterborough
Wiki indicates that the weeping form is sterile and thought to be a hybrid.
https://en.wikipedia.org/wiki/Tilia_tomentosa
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Thank you everyone. After calling more companies and doing more searches, it is in fact a tree that is a cross hybrid. So with that being said, if anyone knows where I could buy one in the USA or a company in the U. K. that ships to the USA please let me know.