I've had my eye on the attached plant for some time but have not been able to nail it down. I believe it could be a species of scilla, galanthus or leucojum but have found nothing with the very broad, strappy leaves and blue/lavender flowers all at the same time. It reaches about 14" tall and about as wide, forming a lovely mound in April or early May. Does anyone know this plant?

 

Thanks for any help.