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GerdIt looks quite small, could it be Tulipa cretica? I grow this, quite distinct from all the other tulip species that I grow. It has flowers not much bigger than a crocus! I think of T saxatilis as being much bigger and more pink in flower.I have attached a couple of pictures for comparison with yours.
greigii 'United States'
Luit,Those two bi-coloured greigii tulips I got from a Dutch comoany as 'Lovely Surprise' and 'United Staes'. But, I think both were mislabeled, though both are tall and very beautiful, corresponding to my taste. The one instead 'Lovely Surprise' seems to be 'Tschaikovsky' though I am not complety sure about that. And I have also doubts about the variety 'United States' (the the colour of the base doesn't correspond to official descriptions). Maybe Mr. C-r can help to clarify this matter?