| Cultivar | Plant Size | Leaf Color | Variegation | Var Color | Origin | Flower Color | Season | Source | Registered |
| 'Bayside Regal' | Medium | Dark-Green | - | - | Hybrid | Light-Purple | July into August | Hicks, Gerry | .2015 |
| 'Benedict's Regal Rhubarb' | Medium | Med-Green | Marginal | White | Unknown | - | - | Benedict, Dr R. (Herb) & Dorothy & Kuenster, Rod | .2010 |
| 'Blue Regal' | Large | Blue/Green | - | - | Hybrid | Pale-Lavender | June into July | Zilis, Mark | .2009 |
| 'Gold Regal' | Giant | Yellow | - | - | Hybrid | Med-Lavender | July | Aden, Paul & Unknown | .1974 |
| 'Gold Regal Margined' | - | - | - | - | Duplicate | - | - | Duplicate Name | --NR-- |
| 'Grand Regal' | Medium | Dark-Green | Medial | Yellow | Unknown | - | - | Herold, Roy | --NR-- |
| 'Honeysong Regal' | Large | Blue/Green | Streaked | White | Nat-Sport | Pale-Lavender | July into August | Summers, Alex | --NR-- |
| 'Krossa Regal' | Giant | Blue/Green | - | - | Unknown | Pale-Lavender | July into August | Krossa, Gus & Summers, Alex | .1980 |
| 'Krossa Regal Splashed' | Giant | Blue/Green | Streaked | White | Nat-Sport | Med-Lavender | July into August | Miller, Jeff | --NR-- |
| 'Krossa Regal Streaked' | Giant | Blue/Green | Streaked | White | Nat-Sport | Med-Lavender | July into August | Lydell, Ransom | --NR-- |
| 'Krossa Regal White Variegation' | Giant | Blue/Green | Streaked | White | TC Sport | Med-Lavender | July into August | Ruh, Peter | --NR-- |
| 'Krossa Regal Yellow Variegation' | Giant | Blue/Green | Streaked | Yellow | TC Sport | Med-Lavender | July into August | Ruh, Peter | --NR-- |
| 'Lime Regal' | Large | Light-Green | - | - | Hybrid | Pale-Lavender | June into July | Zilis, Mark | .2009 |
| 'Misty Regal' | Giant | Med-Green | Medial | Yellow | Nat-Sport | Med-Lavender | July | Stratton, John & Elizabeth | .1996 |
| 'Regal Affair' | Small | Dark-Green | Marginal | White | Nat-Sport | Med-Lavender | July into August | Meyer, Bill | --NR-- |
| 'Regal Chameleon' | Large | Blue/Green | Marginal | Blue-Green | TC Sport | Pale-Lavender | August | Falstad, C.H | .2000 |
| 'Regal Eagle' | Large | Med-Green | Marginal | Yellow | Nat-Sport | Med-Lavender | July | Lydell, Ransom | --NR-- |
| 'Regal Flame' | Large | Blue/Green | - | - | Nat-Sport | Med-Lavender | July into August | Unknown | --NR-- |
| 'Regal Glory' | Medium | Med-Green | - | - | Hybrid | Pale-Lavender | July | Elslager, Ed | .2001 |
| 'Regal Glory' | Large | Med-Green | Marginal | - | Hybrid | Med-Lavender | July into August | Benedict, Dr Ralph (Herb) | --NR-- |
| 'Regal Heir' | Large | Dark-Green | Streaked | White | Nat-Sport | Pale-Lavender | July | Tylinski, Stan | .2003 |
| 'Regal Promenade' | Large | Blue/Green | Streaked | Yellow | Nat-Sport | Pale-Lavender | August | Snyder, Ron | .1994 |
| 'Regal Providence' | Large | Blue/Green | Marginal | White | Nat-Sport | Pale-Lavender | August | Snyder, Ron | .1994 |
| 'Regal Razzle Dazzle' | - | Med-Green | Medial | Light Green | Unknown | - | - | Trucks, Gary | --NR-- |
| 'Regal Rhubarb' | Large | Med-Green | - | - | Unknown | Light-Purple | July into August | Sellers, Van | .1983 |
| 'Regal Ruffles' | Giant | Med-Green | - | - | Hybrid | Near-White | June into July | Minks, Eldren | .1980 |
| 'Regal Rumor' | Large | Med-Green | Streaked | White | Unknown | Pale-Lavender | July into August | Laico, Michael | .2003 |
| 'Regal Skies' | Large | Blue/Green | - | - | Nat-Sport | Med-Lavender | July | Banyai, Bruce | .1999 |
| 'Regal Splash' | Large | Dark-Green | Marginal | Yellow | Nat-Sport | Pale-Lavender | July into August | Unknown | --NR-- |
| 'Regal Splendor' | Large | Blue/Green | Marginal | Creamy White | Nat-Sport | Pale-Lavender | July into August | Walters Gardens | .1987 |
| 'Regal Star' | Large | Dark-Green | Marginal | Yellow | Unknown | - | - | Henjum, Paul | --NR-- |
| 'Regal Supreme' | Giant | Blue/Green | Marginal | White | Nat-Sport | Pale-Lavender | June into July | van den Top, Jan & Van Eechaute, Danny | .2008 |
| 'Regal Tot' | Small | Light-Green | - | - | Hybrid | Light-Purple | July into August | Zilis, Mark | .2010 |
| 'Regal Twist' | Medium | Blue/Green | Medial | White | Nat-Sport | Med-Lavender | July into August | Schulte, Dave & Don | .2007 |
| 'Regalia' | Large | Blue/Green | - | - | Nat-Sport | Pale-Lavender | July into August | Anderson, Kenneth | .1992 |
| 'Regality' | - | - | - | - | Unknown | - | - | van den Top, Jan | --NR-- |
| 'Royal Regal Rhubarb' | Large | Med-Green | Marginal | White | Nat-Sport | Light-Purple | July into August | Benedict, Dr Ralph (Herb) | --NR-- |
| 'Rusty's Gold Regal' | Large | Med-Green | Marginal | Yellow | Nat-Sport | Med-Lavender | July | Rouillier, Denis | --NR-- |
| 'Streaked Regal' | Giant | Light-Green | - | - | Nat-Sport | Med-Lavender | July | Lydell, Ransom & Seaver, Charles | --NR-- |
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