John Sheepers carries a nice selection of species tulips. Maybe you can match yours to a picture at his site at the link below. Here is a link that might be useful: Species Tulips at John Sheepers

Sue, I will be happy to bring you some, Well, I would be thrilled if you would bring me some. They were probably planted somewhere from 40 years ago to 150 years ago YIKES! They have likely multiplied so many times that the bulbs are just way too crowded and small to bloom. You may have hundreds or thousands of small bulbs, too small to bloom. Also, I do get a few blooms up by the house, the squirrels may have moved them, Yes, my guess is that they maybe did a little dividing of them for you...thus a few blooms. I'm off to email you about what else I can bring to the swap for you and your shade beds. I acquired something new and cool from the wild that you might like a start of! Sue

sprengeri was unaffected by leaving for seeds, as are the lady tulips and batalini. I think that the foliage is essential to build up the bulbs for next year so as long as the plants are able to die back unimpeded by other shading plants or competing weeds, all really should be well - no-one is dead-heading in the wild after all. You could consider adding a weak liquid feed after flowering

My T. bakeri ("Lilac Wonder") tulips did not come back, but my "White Dream" (which are some sort of hybrid) are doing well -- this is their third spring. I haven't tried T. clusiana.