| No. | Cultivar Name | Plant Size | Leaf Color | Variegation | Var Color | Origin | Flower Color | Season | Source | Registered |
|
1
| 'Raging River' | Small | Blue/Green | Marginal | White | Unknown | Near-White | June to July | Klotz, Ruby & Klotz, B. | .2020 |
|
2
| 'Ralph' | Large | Blue/Green | Medial | White | Unknown | Near-White | July | O'Harra, Russ | --NR-- |
|
3
| 'Rambunctious' | Giant | Blue/Green | | | Unknown | Near-White | July | Struhar, Bill | .2018 |
|
4
| 'Ready Eddy' | Small | Blue/Green | | | Unknown | Unknown | Unknown | Benedict, Dr Ralph (Herb) | --NR-- |
|
5
| 'Rhapsody in Blue' | Medium | Blue/Green | | | Hybrid | Med-Lavender | August to September to October | Benedict, Dr Ralph (Herb) | .1995 |
|
6
| 'Richland Blue' | Large | Blue/Green | | | Unknown | Near-White | June to July | Wade, Van | .2007 |
|
7
| 'Ripped' | Large | Blue/Green | | | Unknown | Pale-Lavender | July | Soules, Marjorie & Goodenough, Rick | --NR-- |
|
8
| 'Ripple Effect' | Small | Med-Green | Medial | White | TC Sport | Pale-Lavender | July to August | Walters Gardens & Bergeron, Amy | .2008 |
|
9
| 'Rippled Treasure' | Medium | Med-Green | | | Hybrid | Unknown | June to July | Zilis, Mark | .2010 |
|
10
| 'River City Blues' | Large | Blue/Green | | | Unknown | Pale-Lavender | June to July | Zilis, Mark & Ankney, Barry | .2018 |
|
11
| 'Rock of Gibralter' | Large | Blue/Green | | | Sport | Unknown | June to July | Zilis, Mark | .2010 |
|
12
| 'Rock'n'Roll Heart' | Large | Blue/Green | | | Unknown | Unknown | Unknown | Port, Linda | --NR-- |
|
13
| 'Rosedale John Stratton' | Medium | Blue/Green | | | Hybrid | Unknown | Unknown | Hadrava, Jerry | .1999 |
|
14
| 'Ruffled Mouse Ears' | Miniature | Blue/Green | | | Sport | Med-Lavender | July | Zilis, Mark | .2011 |
|