This section is from the book "The Potato: A Compilation of Information from Every Available Source", by Eugene H. Grubb, W. S. Guilford. Also available from Amazon: The Potato: A Compilation Of Information From Every Available Source.
The Minnesota Agricultural Experiment Station in "Bulletin 118" furnishes the following information:
Worthy of trial: early, Acme and Norton Beauty; medium early, Early Bird, Early Michigan, Early Norwood, and Queen of Sweden; medium to medium late, Carman No. 1, Norcross, and New Queen; late, Pingree and California Russet.
2. Twelve groups of potatoes, more or less distinct, are being studied. The more important commercial groups in Minneosta are the Rural, Ohio, Michigan, Cobbler, and Green Mountain groups.
The indications are that, whenever a valuable new variety of potato is originated, different dealers put it on the market under different names. Other evidence also indicates that some dealers put well-known and well-established varieties on the market under new names. Many dealers do not seem to be sufficiently careful to keep their potato seed stock pure or true to variety name. Some, if they run out of a variety, will substitute the one nearest like it which they have on hand. The result of these pernicious practices is an endless confusion of varieties, which may require years of study and observation to unravel. To the farmer it means that he is never sure of the variety he is getting, unless he knows the general reliability of the firm from which he buys, and that it has a man in charge of its potato department who knows varieties."