| Cultivar Name | Plant Size | Leaf Color | Variegation | Var Color | Origin | Flower Color | Season | Source | Registered |
| 'Radiant Light' | Medium | Light-Green | - | - | Unknown | - | - | Livingston, Ron | --NR-- |
| 'Ragtime' | Large | Yellow | - | - | Hybrid | Pale-Lavender | June into July | Ward, Dr Dick & Jane | .2013 |
| 'Rainmaker' | Giant | Med-Green | - | - | Unknown | - | June into July | Ward, Dr Dick & Jane | .2009 |
| 'Raspatini' | Miniature | Med-Green | - | - | Hybrid | Light-Purple | August | Zilis, Mark | .2009 |
| 'Raspberry Ice Cream' | Giant | Yellow | Streaked | Speckles | Nat-Sport | Med-Lavender | July | Unknown | --NR-- |
| 'Razz'n Rick' | Large | Med-Green | Streaked | Yellow | Unknown | - | August to September | Schmidt, Bevie | .2009 |
| 'Ready Eddy' | Small | Blue/Green | - | - | Unknown | - | - | Benedict, Dr Ralph (Herb) | --NR-- |
| 'Ready Freddy' | Giant | Dark-Green | - | - | Unknown | Near-White | June into July | Asch, Stuart | .2010 |
| 'Rebel Rouser' | Medium | Yellow | - | - | Hybrid | Near-White | July | Wasitis, Chick | --NR-- |
| 'Red Bull' | Large | Med-Green | - | - | Hybrid | - | July into August | Van Eechaute, Danny | .2010 |
| 'Red Kitty' | Small | Med-Green | - | - | Unknown | - | - | Terpening, Kent | --NR-- |
| 'Red Light' | Medium | Dark-Green | - | - | Unknown | - | - | Unknown | --NR-- |
| 'Red Rover' | Medium | Med-Green | - | - | Hybrid | Med-Lavender | August to September | Moore, Jeff & Schwarz, Jim | .2015 |
| 'Red Sails in the Sunset' | Small | Light-Green | - | - | Hybrid | Light-Purple | August | Van Ostrand, John | .2004 |
| 'Red Stilts' | Large | Med-Green | - | - | Hybrid | Pale-Lavender | June into July | Van Eechaute, Danny | .2011 |
| 'Reddish Dot' | Medium | Med-Green | - | - | Hybrid | Deep-Purple | July into August | Liu, Donghuan | .2016 |
| 'Reddy Eddy' | Large | Dark-Green | - | - | Unknown | - | August to September | Benedict, Dr R. (Herb) & Dorothy & Kuenster, Rod | .2010 |
| 'Redneck Mardi Gras' | Small | Yellow | - | - | Unknown | Deep-Purple | August to September | Duncan, Mary Jo | .2016 |
| 'Regal Tot' | Small | Light-Green | - | - | Hybrid | Light-Purple | July into August | Zilis, Mark | .2010 |
| 'Reiho' | Small | Med-Green | Medial | White | Unknown | - | - | Unknown | --NR-- |
| 'Renaissance' | Medium | Med-Green | Streaked | Speckles | Nat-Sport | Pale-Lavender | July | Minks, Eldren | .1983 |
| 'Rendezvous' | Medium | Blue/Green | Marginal | White | Nat-Sport | Pale-Lavender | July into August | Zilis, Mark & Schwarz, Jim | .2014 |
| 'Retread' | Small | Med-Green | Marginal | White | Hybrid | Pale-Lavender | July | Nyikos, Frank | .2000 |
| 'Rheingold' | Medium | Yellow | Marginal | Green | Unknown | - | - | Kohlein, Fritz | --NR-- |
| 'Richard Taylor' | Large | Med-Green | - | - | Hybrid | Pale-Lavender | June into July | Seaver, Mildred & Walek, Kevin | .2009 |
| 'Ringmaster' | Small | Blue/Green | Marginal | White | Nat-Sport | Pale-Lavender | July | Zilis, Mark | .2011 |
| 'Rippled Elf' | Medium | Med-Green | - | - | Unknown | - | - | Powell, Loteta & Walek, Kevin | .2009 |
| 'Rippled Green Cup' | Medium | Dark-Green | - | - | Unknown | - | - | Wade, Van | --NR-- |
| 'Rippled Treasure' | Medium | Med-Green | - | - | Hybrid | - | June into July | Zilis, Mark | .2010 |
| 'Risa' | Small | Med-Green | - | - | Unknown | Med-Lavender | July into August | Dupre, Dirk | .2006 |
| 'River of Gold' | Large | Yellow | - | - | Unknown | - | June into July | Ward, Dr Dick & Jane | .2014 |
| 'Rock Concert' | Large | Blue/Green | Streaked | Speckles | Unknown | Med-Lavender | July into August | Kuenster, Rod | .2009 |
| 'Rock of Ages' | Giant | Blue/Green | - | - | Nat-Sport | Pure-White | June into July | Ward, Dr Dick & Jane | .2009 |
| 'Rocket's Red Glare' | Medium | Med-Green | - | - | Unknown | - | - | Stegeman, Bev & Dave | --NR-- |
| 'Rocky Fork' | Medium | Blue/Green | - | - | Unknown | Pale-Lavender | June into July | Ward, Dr Dick & Jane | .2003 |
| 'Rocky Point' | Medium | Yellow | - | - | Unknown | - | - | Goodenough, Rick | --NR-- |
| 'Rookie Mouse' | Miniature | Med-Green | - | - | Nat-Sport | Light-Purple | June into July | Szustakiewicz, Peter | --NR-- |
| 'Rosedale Coalminer's Special' | Medium | Med-Green | Streaked | Speckles | Unknown | Light-Purple | July | Hadrava, Jerry | --NR-- |
| 'Rosedale Golden City' | Large | Light-Green | - | - | Unknown | Near-White | June into July | Hadrava, Jerry | .1999 |
| 'Rosedale Golden Star' | Medium | Light-Green | Marginal | White | Unknown | - | - | Hadrava, Jerry | --NR-- |
| 'Rosedale Golden Teapot' | Large | Light-Green | Marginal | Yellow | Hybrid | Pale-Lavender | July into August | Hadrava, Jerry | .2000 |
| 'Rosedale Houdini' | Medium | Med-Green | Streaked | Yellow | Hybrid | Light-Purple | July into August | Hadrava, Jerry | .2000 |
| 'Rosedale Knox' | Large | Yellow | - | - | Unknown | Near-White | June into July | Hadrava, Jerry | .1999 |
| 'Rosedale Monica Havana' | Large | Med-Green | Marginal | Yellow | Hybrid | Pale-Lavender | July | Hadrava, Jerry | --NR-- |
| 'Rosedale Sugar Time' | Medium | Med-Green | Marginal | White | Unknown | Light-Purple | August | Hadrava, Jerry | .1999 |
| 'Rosedale Tail Feathers' | Small | Med-Green | Marginal | White | Unknown | - | - | Hadrava, Jerry | --NR-- |
| 'Rosedale Waterwheel' | Large | Med-Green | Marginal | White | Hybrid | Light-Purple | July | Hadrava, Jerry | .2000 |
| 'Rosy' | Medium | Blue/Green | - | - | Unknown | - | - | Klose, Heinz | --NR-- |
| 'Rough Knight' | Small | Blue/Green | - | - | Hybrid | Med-Lavender | August | Beilstein, Doug & Mardy | .2013 |
| 'Roughrider' | Medium | Med-Green | Marginal | White | Hybrid | Pure-White | August to September | Graves, Butch | .2008 |
| 'Royal Charm' | Small | Blue/Green | Streaked | White | Nat-Sport | Pale-Lavender | June into July | Johnson, Greg | .2004 |
| 'Royal Susan' | Large | Med-Green | Streaked | White | Nat-Sport | Pale-Lavender | August | Benedict, Dr Ralph (Herb) | --NR-- |
| 'Royal Wave' | Small | Blue/Green | Streaked | White | Nat-Sport | Pale-Lavender | June into July | Johnson, Greg | .2004 |
| 'Rubies and Ruffles' | Medium | Dark-Green | Marginal | White | Unknown | Med-Lavender | August to September | Goodwin, Randy | .2009 |
| 'Ruby' | Small | Med-Green | - | - | Hybrid | Light-Purple | August to September | Savory, Dennis | .2013 |
| 'Ruby Desires' | Medium | Dark-Green | Marginal | Yellow | Unknown | - | - | Klotz, Ruby | --NR-- |
| 'Ruffed Up' | Large | Yellow | - | - | Hybrid | Pale-Lavender | August to September | Carlson, Monty & Julie | .2009 |
| 'Ruffian' (Asch) | Medium | Dark-Green | - | - | Nat-Sport | Pale-Lavender | July | Asch, Stuart | .2009 |
| 'Ruffle My Feathers' | Small | Med-Green | Marginal | White | Nat-Sport | Med-Lavender | - | Livingston, Ron | --NR-- |
| 'Ruffled Mouse Ears' | Miniature | Blue/Green | - | - | Nat-Sport | Med-Lavender | July | Zilis, Mark | .2011 |
| 'Russell Square' | Medium | Blue/Green | - | - | Unknown | - | - | Crockett, Clyde | --NR-- |
| 'Rusty's Blue Star' | Miniature | Med-Green | - | - | Unknown | - | - | Rouillier, Denis | --NR-- |
| 'Rutherford Birchard Hayes' | Medium | Light-Green | - | - | Unknown | Med-Lavender | - | Ruh, Peter & Jean | .2010 |
|