Over the many years, there has been some confusion regarding P. orientale cultivars. Some people grew the cultivars from known root cuttings, but then ended up "trading seeds" produced by these known vegetatively propagated varieties. Once the seeds were planted & grown out, it could be difficult to know, if what you received in the way of a propagated root, was actually from the seeds of the original cultivar, or the actual original version, propagated by root division,
There were once some "minicap" hybrids produced in California, I recall were later sold off, to a grower in U.K. & those were called the "Super Poppy" series. So, what was once grown in the States & readily available, is somewhat difficult to obtain, now that they are across the Atlantic, in the "National Collection", grown by an individual in England.
Some, more easily to locate, are 'Heartbeat & 'Snowgoose' , & I think maybe 'Shasta'. I used to have 'Medallion' some years ago...One of the more recent seed grown variety that is popular, is 'Plum Pudding', which orginated from Thompson & Morgan, as did 'Coral Reef', quite some years ago & can easily be confused ( & crossed with) other pink cultivars.