I asked Elizabeth Park and received the following response from Ruth Bennett in which Variegata and Silver Band are distinguished from one another, and Variegata is stated to be what I saw at Elizabeth Park and posted to this thread:
"Hello! Iris Silver Band is a cultivar bred from Japanese iris Variegata. Bauer/ Coble hybridized it in the late 1980's. Therefore they are two separate irises, similar but with distinct differences. Silver Band is known for more reddish purple blooms.
Hope this helps.
We,have JI iris Variegata at the park. Ensata Gardens should have Silver band in their catalog for that is the business of Bauer/Coble. Our Japanese irises we purchased from Eartheart Gardens of Maine which have New England hybridized JI irises."
So I would like to upload my images to Variegata, but I noticed that it has been combined with Silverband in the NGA database.