| Cultivar Name | Plant Size | Leaf Color | Variegation | Var Color | Origin | Flower Color | Season | Source | Registered |
| 'Red River' | Small | Dark-Green | - | - | Hybrid | - | - | Malloy, Alex | --NR-- |
| 'Red Sea' | Large | Med-Green | Streaked | White | Unknown | - | - | Unknown | --NR-- |
| 'Restless Sea' | Medium | Med-Green | - | - | Hybrid | Pale-Lavender | August to October | Hansen, Hans | .2006 |
| 'Rippling Waters' | Large | Med-Green | - | - | Unknown | - | - | Wade, Van | --NR-- |
| 'Rippling Waves' | Giant | Dark-Green | - | - | Hybrid | Pale-Lavender | June into July | Nesmith, Elizabeth & The American Hosta Society | .1986 |
| 'Riptide' | Medium | Blue/Green | - | - | Hybrid | Pale-Lavender | August | Sellers, Van | .1987 |
| 'Rising Surf' | Medium | Med-Green | Marginal | White | Unknown | Pale-Lavender | July | Ruh, Peter | --NR-- |
| 'Rising Tide' | Large | Blue/Green | Marginal | White | TC Sport | - | - | Walters Gardens | .1984 |
| 'River Nile' | Giant | Blue/Green | - | - | Hybrid | Near-White | June into July | Moldovan, Steve | .1983 |
| 'River of Gold' | Large | Yellow | - | - | Unknown | - | June into July | Ward, Dr Dick & Ward, Jane | .2014 |
| 'River's Edge' | Large | Blue/Green | Marginal | White | Sport | Pale-Lavender | July | Walek, Kevin | --NR-- |
| 'Rosedale Watersprout' | Medium | Dark-Green | Medial | White | Unknown | Pale-Lavender | June into July | Hadrava, Jerry | --NR-- |
| 'Rosedale Waterwheel' | Large | Med-Green | Marginal | White | Hybrid | Light-Purple | July | Hadrava, Jerry | .2000 |
| 'Rough River' | Large | Med-Green | Streaked | Speckles | Sport | Near-White | July | Hawes, James | --NR-- |
| 'Rough Waters' | Large | Blue/Green | - | - | Hybrid | Near-White | June into July | Armstrong, Maxine | .1969 |
| 'Roxton Falls' | Giant | Blue/Green | - | - | Unknown | - | - | Bastille, Jocelyne | --NR-- |
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