Black Cherry = Burgundy Cherry; Cherry Red and Dexter's Red = Wissahickon; Arlequin, Harlequin, and Dexter's Arlequin = Dexter's Harlequin; Red House = Dorothy Russell; and at least some plants circulating under the name Charlestown are identical to Sandwich Appleblossom, the registered name of a Dexter formerly known by the unregistered name of Appleblossom.
John Wister is closely akin or identical to Janet Blair (see note 2).
Dexter's Salmon (not to be confused with "Dexter, Salmon" sold at the 1980 ARS Convention in Massachusetts), Edwin Beinecke, Emissary, Everitt Miller, Forestdale, and Mrs. H.B. Gardner appear to have vanished.
The unregistered "Dexter's Pink" (reportedly identical to a clone known as Vossberg's Pink #1 and SAE #1) should not be confused with an azalea registered under this name. Skyglow and Wellfleet (and also possibly Chatham and Sagamore Bayside) were not Dexter hybrids but rather hybrids acquired by Dexter from the nearby Farquhar Nursery.
Non-Dexter hybrids have been registered under the names of Pink Satin and Zanzibar; the Dexters bearing these names may be registered in the future as "Dexter's Pink Satin" and "Dexter's Zanzibar".
A few Dexters named before 1980 as well as a good many named since then have not been included on this list, the primary source for which is Hybrids and Hybridizers (P.A. Livingston and F.H. West, eds.; Newtown Square, Pennsylvania; Harrowood Books; 1978).