Hoo boy. Ok, I'll go through the list. This could take a while. Btw, I have 3/4 of an acre and I'm quite fond of crazy profusions of color in no particular order. I'm not going to include unregistered plants or NOIDS, although many of the are clearly old and came with the house. I won't list plants that are gone or that haven't bloomed here yet. I'll use 2,000 as the cut off year.
Acres of Angels, Wild 1976
Alabama Jubilee, Webster 1988, love this plant
All American Chief, Sellers 1994, right on the edge of historic, also love this
All Truth, Wild 1987
Alnilam, Saxton 1949
Along the Way, Stevens-D 1980
Always Afternoon, Morss 1987
Antique Treasure, Wild 1985
Baby Blue Eyes, Shooter 1998 ( still last century)
Bandit Man, Stevens-D 1979
Banned in Boston, Simpson-D 1994
Blackthorne, Trimmer 1996
Blueberry Breakfast, Rose 1988, an old favorite
Blueberry Candy, Stamile 1993
Bubbling Over, Joiner 1991
Bumble Bee, Williamson 1964
Burgess Dragonfly, Albers 1999
Buttered Popcorn, Benzinger 1971
Caramel and Honey, Wild 1989
Casco Bay Delight, Valente 1999, great plant
Cherry Lace, Wild 1972
Chicago Apache, Marsh-Klehm 1981
Chicago Arnie's Choice, Marsh-Klehm 1981
Chicago Ruby, Klehm 1977
Child Bride, Warner 1972
Chinese Scribe, Munson-RW 1991
Chorus Line, Kirshhoff-D 1981
Cloverdale, Peck 1974
Condilla, Grooms 1977
Copper Chameleon, Sobek 1995, I really love this
Country Fair Winds, Klehm 1988
Country Vista, Wild 1988
Court Troubadour, Brooks-H 1984, with bee
Cranberry Baby, Croker 1984
Cranberry Cove, Stamile 1985
Crimson Pirate, Sass-HR 1951, this might be Sammy Russell, Russell 1951, they are super similar and I can't tell from photos. This is all over my yard, grows like a weed, reblooms, bud builds, super strong
Dance Ballerina Dance, Peck 1976
Dawn Ballet, Reckamp 1975
Decatur Cherry Smash, Davidson 1981
Demetrius, Harris-H 1977
Do the Twist, Lambertson 1998
Doll House, Wild 1975
Double Tulip, Miles-J 1963
Dublin Elaine, Joiner 1987
Duke of Earl, Benz 1987
Dunrobin Red Velvet, Knott 1997
Ok, that's 4 letters of the alphabet, generating 46 entries. More later!