| Cultivar Name | Plant Size | Leaf Color | Variegation | Var Color | Origin | Flower Color | Season | Source | Registered |
| 'Ragtime' | Large | Yellow | - | - | Hybrid | Pale-Lavender | June into July | Ward, Dr Dick & Jane | .2013 |
| 'Rainbow Delight' | Small | Med-Green | Streaked | White | Unknown | - | July into August | Benedict, Dr R. (Herb) & Dorothy & Kuenster, Rod | .2010 |
| 'Raucous Ruffles' | Medium | Blue/Green | - | - | Hybrid | - | - | Dean, Don | .2008 |
| 'Raving Beauty' | Large | Yellow | - | - | Unknown | - | - | Goodwin, Randy | .2003 |
| 'Raz Pizzazz' | Large | Med-Green | Streaked | Speckles | Nat-Sport | Near-White | July | Martin, Bud | --NR-- |
| 'Razz'n Rick' | Large | Med-Green | Streaked | Yellow | Unknown | - | August to September | Schmidt, Bevie | .2009 |
| 'Ready Freddy' | Giant | Dark-Green | - | - | Unknown | Near-White | June into July | Asch, Stuart | .2010 |
| 'Red Bull' | Large | Med-Green | - | - | Hybrid | - | July into August | Van Eechaute, Danny | .2010 |
| 'Reflected Glory' | Large | Med-Green | Marginal | Light Green | Unknown | Med-Lavender | June into July | Seaver, Mildred & Seaver, Charles | .2015 |
| 'Regal Glory' | Medium | Med-Green | - | - | Hybrid | Pale-Lavender | July | Elslager, Ed | .2001 |
| 'Resurrection Galaxy' | Large | Dark-Green | Streaked | Speckles | Nat-Sport | Med-Lavender | July | Elslager, Ed | .1999 |
| 'Reverend Mac' | Medium | Blue/Green | - | - | Nat-Sport | Pale-Lavender | July into August | Van Eechaute, Danny | .2011 |
| 'Rhino Blue' | Large | Blue/Green | - | - | Nat-Sport | Near-White | June into July | Rawson, Don | .2010 |
| 'Rhino Hide' | Medium | Blue/Green | Medial | Yellow | Unknown | Near-White | June into July | Rawson, Don | .2007 |
| 'Richland Clear Fork Mist' | Medium | Med-Green | Marginal | Yellow | Unknown | Pale-Lavender | July into August | Wade, Van | --NR-- |
| 'Richmond Blue' | Large | Blue/Green | - | - | TC Sport | Near-White | June into July | Zumbar, Wm & Walek, Kevin | .2009 |
| 'Rising Star' | Medium | Yellow | Marginal | Pale Yellow | Nat-Sport | Med-Lavender | July into August | Mortko, Rob | .2013 |
| 'Robb's Dream' | Large | Med-Green | Streaked | White | Unknown | - | June into July | McWilliams, Robb & Philips, Hugo | .2011 |
| 'Robyn Duback' | Medium | Med-Green | Marginal | Yellow | Unknown | Med-Lavender | August to September | Benedict, Dr R. (Herb) & Dorothy & Kuenster, Rod | .2010 |
| 'Rock Concert' | Large | Blue/Green | Streaked | Speckles | Unknown | Med-Lavender | July into August | Kuenster, Rod | .2009 |
| 'Rock of Gibralter' | Large | Blue/Green | - | - | Nat-Sport | - | June into July | Zilis, Mark | .2010 |
| 'Rocky Fork' | Medium | Blue/Green | - | - | Unknown | Pale-Lavender | June into July | Ward, Dr Dick & Jane | .2003 |
| 'Rocky Mountain High' | Large | Med-Green | Marginal | Yellow | Hybrid | Pale-Lavender | June into July | Kuk, Bob | .1991 |
| 'Rocky Point' | Medium | Yellow | - | - | Unknown | - | - | Goodenough, Rick | --NR-- |
| 'Romaine' | Large | Med-Green | - | - | Unknown | Pure-White | July into August | Schwarz, Jim & Karen | .2011 |
| 'Roostertail' | Medium | Med-Green | Streaked | White | Hybrid | Near-White | July | Elslager, Ed | .2002 |
| 'Rosaleen' | Small | Dark-Green | Marginal | White | Hybrid | Light-Purple | June into July | Gilligan, Madelon | .2017 |
| 'Rosedale Barnie' | Medium | Dark-Green | - | - | Hybrid | Light-Purple | July | Hadrava, Jerry | .1999 |
| 'Rosedale Buddy Holly' | Large | Med-Green | - | - | Unknown | Near-White | June into July | Hadrava, Jerry | .1999 |
| 'Rosedale Golden Chips' | Small | Yellow | - | - | Hybrid | - | June | Hadrava, Jerry | .1999 |
| 'Rosedale Golden City' | Large | Light-Green | - | - | Unknown | Near-White | June into July | Hadrava, Jerry | .1999 |
| 'Rosedale Lela Mae' | Large | Blue/Green | Marginal | Yellow | Hybrid | Near-White | June | Hadrava, Jerry | .1999 |
| 'Rosedale Mrs. President' | Large | Dark-Green | - | - | Hybrid | Near-White | July | Hadrava, Jerry | .1999 |
| 'Rosedale Peek-a-Boo' | Large | Yellow | - | - | Unknown | - | - | Hadrava, Jerry | --NR-- |
| 'Rosedale Rob Lucomus' | Large | Blue/Green | - | - | Unknown | Near-White | June | Hadrava, Jerry | --NR-- |
| 'Rosedale Robert Hackbarth' | Large | Yellow | - | - | Unknown | Near-White | June into July | Hadrava, Jerry | .1999 |
| 'Rosedale Scrambled Eggs' | Large | Yellow | - | - | Unknown | Near-White | July | Hadrava, Jerry | .1999 |
| 'Rostraver Heritage' | Large | Med-Green | - | - | Unknown | Near-White | July into August | Zolock, Steve & Sarah | .2009 |
| 'Rough Rider' | Medium | Blue/Green | - | - | Unknown | - | - | Beilstein, Doug | --NR-- |
| 'Route 66' | Large | Yellow | - | - | TC Sport | - | July into August | Zilis, Mark | .2005 |
| 'Royal Charm' | Small | Blue/Green | Streaked | White | Nat-Sport | Pale-Lavender | June into July | Johnson, Greg | .2004 |
| 'Royal Empress' | Giant | Med-Green | Marginal | Chartreuse | Nat-Sport | Pale-Lavender | June into July | Rawson, Don | .2016 |
| 'Royal Wave' | Small | Blue/Green | Streaked | White | Nat-Sport | Pale-Lavender | June into July | Johnson, Greg | .2004 |
| 'Royal Wedding' | Medium | Med-Green | Marginal | White | TC Sport | Pure-White | August to September | Bergeron, Amy & Walters Gardens | --NR-- |
| 'Ruffed Up' | Large | Yellow | - | - | Hybrid | Pale-Lavender | August to September | Carlson, Monty & Julie | .2009 |
| 'Ruffles Galore' | Medium | Blue/Green | - | - | Unknown | - | June into July | Powell, Loleta & Walek, Kevin | .2009 |
| 'Ruth Reed Mraz' | Large | Med-Green | - | - | Unknown | Near-White | July into August | Dow, Ronald & Mraz, Arthur | .2012 |
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