im not sure but i dont think its intermedia, dosent intermedia lift its self an a central stalk as it ages , a couple of yours look mature but are still nestled to the media, but im not the expert here , so i guess it could be some hybrid , or a cultivar im not familiar with , it is nice though , and wouldn't intermedia be dormant now or is this in side.
sorry you asked what it is , not what its not, im not sure .spathulata?