Don Hollingsworth is a peony hybridizer from Maryville, MO. He has around 50 peonies registered with the American Peony Society (I believe he is an active member). Don turned 90 years old last April (2018)!
In an interview with southernpeony.com in 2016, he listed eight of his most popular introductions: 'Garden Treasure', 'Many Happy Returns', 'My Love', 'LaDonna', 'Lorelei', 'Summer Glow', 'Show Girl', and 'Pink Teacup'. Of these his most favorite is 'Garden Treasure' which he crossed ~1968 and is one of the first American Bred intersectional (Itoh) hybrid peonies. He registered it with the APS in 1984.
'Garden Treasure' is somewhat special to me as well. Fourteen years ago I purchased this peony from Adelman for $100. This was unusual for me. I was used to spending $15-20 for a premium peony. Bottom line, it has been one of my favorite peonies every year.
I currently have 7 peonies introduced by Hollingsworth: Paeonia 'Belleville', Paeonia 'Border Charm', Paeonia 'Folk Art', Paeonia 'Garden Treasure', Paeonia 'Prairie Charm', Paeonia 'Prairie Star', Paeonia 'Show Girl'
First to bloom this year is Peony 'Show Girl'
"Paeonia 'Show Girl', 2018 photo, (2-AN-PK) Hybrid Peony, (Hollingsworth 1984), USDA Hardiness Zone 4, Medium height, Japanese /Anemone form, pink guard petals, yellow cream petalodes, side-buds, early bloomer, Michigan Bloom Month 5c, In Garden Bed V2 for 2.6 YEARS (Bann). Planted in 2015.
Parentage Dawn Pink x Echo (second generation of Lacti x Anomola). Mature plants can develop center petals. Dark green foliage. Flowers are well above the foliage.