| Cultivar Name | Plant Size | Leaf Color | Variegation | Var Color | Origin | Season | Source | Registered |
| 'Rain Forest' | Large | Med-Green | - | - | Hybrid | August to October | Goodwin, Randy | .1996 |
| 'Raspberry Sundae' | Small | Dark-Green | Medial | White | Unknown | August to October | Korlipara, Harini & Gossett & Terra Nova Nurseries | --NR-- |
| 'Red Cadet' | Medium | Dark-Green | - | - | Hybrid | August to October | Van Eechaute, Danny | .2005 |
| 'Red Legs' | Large | Dark-Green | - | - | Hybrid | August to October | Sugita, Hajime & Ruh, Peter | .1998 |
| 'Red October' | Medium | Dark-Green | - | - | Hybrid | September to October | Herold, Roy & Walek, Kevin | .2009 |
| 'Red Sox' | Medium | Dark-Green | - | - | Hybrid | August to October | Herold, Roy & Walek, Kevin | .2009 |
| 'Redolent Nosegay' | Large | Dark-Green | Marginal | Yellow | Nat-Sport | August to October | Hawes, James | .1999 |
| 'Restless Sea' | Medium | Med-Green | - | - | Hybrid | August to October | Hansen, Hans | .2006 |
| 'Rhapsody in Blue' | Medium | Dark-Green | - | - | Hybrid | August to October | Benedict, Dr Ralph (Herb) | .1996 |
| 'Ringtail' | Medium | Dark-Green | - | - | Hybrid | August to October | Terpening, Kent | .2005 |
| 'Royal Diadem' | Large | Med-Green | Marginal | White | Nat-Sport | August to October | Zumbar, Wm & Zilis, Mark | --NR-- |
| 'Royal Gold' | Large | Yellow | - | - | TC Sport | August to October | Wayside Gardens | --NR-- |
| 'Royal Rim' | Large | Med-Green | Marginal | White | Nat-Sport | August to October | Zumbar, Wm & Zilis, Mark | --NR-- |
| 'Royal Standard' | Large | Med-Green | - | - | Hybrid | August to October | Grullemans, John J. & Wayside Gardens | .1986 |
| 'Royal Standard' - Mediovariegated | - | Med-Green | Medial | Yellow | TC Sport | August to October | Unknown | --NR-- |
| 'Royal Standard' - Yellow Form | Large | Yellow | - | - | TC Sport | August to October | Unknown | --NR-- |
| 'Royal Standard Special' | Large | Med-Green | Marginal | Yellow | TC Sport | August to October | Grullemans, John J. & Wayside Gardens | --NR-- |
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