I think I have 16 varieties that will produce some apples this year. 65 or so total if you count my nursery. Editing this now as I was busy at the time of the original answer. I think my blue bowl pictures will continue (and maybe in ripening order, with, ChestnutCrabs, Whitney, HoneyCrisp, PixieCrunch, KiddsOrangeRed, one I call MysteryGreen, one I call JonaGold but it probably isn't, WicksonCrab, MysteryRed, OxfordBlack, Sundance, Dabinette, GrannieSmith and GoldRush,. If you count the 3 I've posted that is 17 varieties. The number of trees containing these varieties is 25 or so as I have multiples of favorites like HC, PixieCrunch, GoldRush. These are the trees bearing this year. Should've also have HoneyGold, Enterprise and Liberty but the June drop floored me (and the apples). Ages of the trees are from 2010, 2012 and 2013.
Over the years, I've ordered scions mainly from MapleValley and Fedco. The one I call JonaGold now (might be just GoldenDelicious) was supposed to be ArkieBlack. Ha! Its Green with a red blush...its a good to great apple so I'm keeping it, but its a long way from an ArkansasBlack apple what it was supposed to be. Surprise! You don't know your order got messed up until years later - ha!
The mystery trees are supposed to be crab apple/liner tree seedlings. The one supposed to be American crab (forgot to mention my AmericanCrab..loaded too, all for the deer), I call it MysteryRed (oh, forgot this one its supposed to be a twin, but it ain't, its loaded this year too) grows an apple the size of a RedDelicious - complete with the lobes on the bottom and all! But its kinda tasteless and dry...cider here we come with it. It's a 2010 tree and big and pretty and crops pretty well too so I hate topwork it over to a great one. The MysteryGreen - same thing...supposed to be SiberianCrab...a seedling..but grows a nice size green apple which is really good / one I look forward to every year.
Strange world this apple world.