| Cultivar Name | Source | Plant Size | Leaf Color | Variegation | Var Color | Origin | Flower Color | Season | Registered |
| 'Cadence' | Livingston, Ron | Large | Med-Green | Streaked | White | Unknown | - | - | --NR-- |
| 'Cajun Sunrise' | Elslager, Ed | Medium | Yellow | Streaked | Yellow | Hybrid | Pale-Lavender | July into August | .2000 |
| 'Cambria Blue' | Benedict, Dr Ralph (Herb) | Medium | Blue/Green | - | - | Unknown | - | - | --NR-- |
| 'Candelabra' | Benedict, Dr R. (Herb) & Walek, Kevin | Small | Blue/Green | - | - | Unknown | Light-Purple | July into August | .2009 |
| 'Candle In The Dark' | Asch, Stuart | Medium | Light-Green | Streaked | Yellow | Unknown | - | - | --NR-- |
| 'Candlewood' | Banyai, Pauline & Asch, Stuart | Large | Med-Green | - | - | Unknown | Pale-Lavender | July | .2004 |
| 'Candy Cane' | Banyai, Pauline & Elslager, Ed | Small | Blue/Green | Marginal | Yellow | Unknown | Deep-Purple | July | .1995 |
| 'Candy Striper' | Woodford, R. | Large | Med-Green | Streaked | White | Nat-Sport | Pale-Lavender | August | .2000 |
| 'Cardboard' | Livingston, Ron | Medium | Med-Green | - | - | Unknown | Pure-White | July into August | --NR-- |
| 'Cardiac' | Asch, Stuart | Large | Blue/Green | - | - | Unknown | - | - | --NR-- |
| 'Cat's Meow' | Falstad, C.H | Medium | Med-Green | Marginal | Chartreuse | Nat-Sport | Pure-White | June into July | .1998 |
| 'Celestial' | Elslager, Ed | Large | Blue/Green | Marginal | Creamy White | Hybrid | Pale-Lavender | June into July | .2000 |
| 'Celestial Lightning' | Elslager, Ed | Small | Light-Green | Streaked | Yellow | Nat-Sport | Pale-Lavender | June into July | .2005 |
| 'Center of Attention' | Kulpa, John | Medium | Med-Green | Medial | Creamy White | Hybrid | Light-Purple | July | .1999 |
| 'Chalice of Gold' | Elslager, Ed | Large | Yellow | - | - | Hybrid | Pale-Lavender | June into July | .2004 |
| 'Change of Heart' | Hansen, Hans | Miniature | Light-Green | Marginal | White | Hybrid | - | - | --NR-- |
| 'Chariot's of Fire' | Dishon, Jim | Medium | Light-Green | Marginal | Yellow | Hybrid | Light-Purple | August to October | .2004 |
| 'Charisma' | Asch, Stuart | Medium | Dark-Green | Streaked | Yellow | Unknown | - | - | --NR-- |
| 'Chartreuse Domes' | Livingston, Ron | Large | Yellow | - | - | Unknown | Pale-Lavender | July into August | --NR-- |
| 'Chartreuse Fountain' | Livingston, Ron | Medium | Yellow | - | - | Unknown | - | - | --NR-- |
| 'Chartreuse Piecrust' | Owens, Clarence | Large | Yellow | - | - | Hybrid | Near-White | July | .1985 |
| 'Chartreuse Spoons' | Livingston, Ron | Medium | Light-Green | - | - | Unknown | Pale-Lavender | July into August | --NR-- |
| 'Cherry Berry Streaked' | Schmid, Tom | Medium | Blue/Green | Streaked | Speckles | Nat-Sport | Light-Purple | July into August | --NR-- |
| 'Cherry Tomato' | Walters Gardens | Miniature | Med-Green | Medial | White | Nat-Sport | Deep-Purple | July | .2008 |
| 'Chickadee' | Benedict, Dr Ralph (Herb) | Medium | Med-Green | Marginal | White | Unknown | Pure-White | August | --NR-- |
| 'Chickenhearted' | Groothuis, Mike | Medium | Light-Green | - | - | Hybrid | Pure-White | July into August | .2012 |
| 'Childhood Fantasy' | Livingston, Ron | Medium | Blue/Green | - | - | Hybrid | - | - | --NR-- |
| 'Christmas Cup' | Asch, Stuart | Small | Dark-Green | - | - | Hybrid | Deep-Purple | July | .2000 |
| 'Christmas Dome' | Livingston, Ron | Large | Light-Green | - | - | Unknown | - | - | --NR-- |
| 'Church Mouse' | Walters Gardens | Small | Dark-Green | - | - | Nat-Sport | Pale-Lavender | July | .2012 |
| 'City Slicker' | Dishon, Jim | Medium | Dark-Green | Marginal | White | Hybrid | Deep-Purple | August to October | .1996 |
| 'Clarence Nance' | Benedict, Dr Ralph (Herb) | Large | Med-Green | Marginal | Yellow | Unknown | - | - | --NR-- |
| 'Clarence Owens' | Kulpa, John | Large | Dark-Green | Medial | Yellow | Unknown | Pale-Lavender | June into July | .2000 |
| 'Clean Lines' | Livingston, Ron | Medium | Med-Green | - | - | Unknown | Light-Purple | August | --NR-- |
| 'Clifford's Broken Heart' | Clifford, John | Medium | Med-Green | Marginal | White | Nat-Sport | Pale-Lavender | June into July | .2000 |
| 'Clifford's Comet' | Clifford, John | Medium | Dark-Green | Medial | White | Nat-Sport | Pale-Lavender | July | .2000 |
| 'Clifford's Forest Fire' | Clifford, John | Large | Med-Green | Marginal | White | Nat-Sport | Pale-Lavender | July into August | .2000 |
| 'Clifford's Polar Moon' | Clifford, John | Large | Light-Green | Marginal | Green | Nat-Sport | Pale-Lavender | July into August | .2000 |
| 'Clifford's Stingray' | Clifford, John & Ken | Medium | Dark-Green | Medial | White | Nat-Sport | Pale-Lavender | July | .2000 |
| 'Climax' | Jones, Gil | Large | Med-Green | Marginal | Yellow | Nat-Sport | Pale-Lavender | June | .2000 |
| 'Cloud Nine' | Trucks, Gary | Giant | Med-Green | Streaked | Yellow | Nat-Sport | Med-Lavender | July | --NR-- |
| 'Clyde's Birthday' | Benedict, Dr Ralph (Herb) | Large | Blue/Green | Streaked | White | Hybrid | - | - | --NR-- |
| 'Color a la Mode' | Elslager, Ed | Medium | Dark-Green | Medial | White | Hybrid | Pale-Lavender | July | .2000 |
| 'Color Revolt' | Rawson, Don | Large | Med-Green | - | - | Nat-Sport | Med-Lavender | July into August | .2010 |
| 'Confetti Cup' | Krul, Nancy & Belle Gardens | Small | Dark-Green | Streaked | White | Unknown | Near-White | July | --NR-- |
| 'Connie' | Benedict, Dr Ralph (Herb) | Large | Yellow | Marginal | Greenish White | Nat-Sport | Near-White | June into July | .1987 |
| 'Conquistador' | Livingston, Ron | Large | Blue/Green | - | - | Hybrid | Light-Purple | July into August | --NR-- |
| 'Contort' | Livingston, Ron | Large | Blue/Green | - | - | Unknown | - | - | --NR-- |
| 'Contorted Dragon' | Livingston, Ron | Large | Blue/Green | - | - | Hybrid | - | - | --NR-- |
| 'Convivial' | Livingston, Ron | Medium | Dark-Green | Marginal | White | Unknown | Near-White | - | --NR-- |
| 'Cool As A Cucumber' | Walters Gardens | Large | Med-Green | Medial | White | Nat-Sport | Pale-Lavender | June into July | .2012 |
| 'Cool Blue' | Benedict, Dr R. (Herb) & Kuenster, Rod | Medium | Blue/Green | - | - | Unknown | Med-Lavender | June into July | --NR-- |
| 'Cool Cat' | Elslager, Ed | Large | Blue/Green | Streaked | Yellow | Nat-Sport | Med-Lavender | July into August | .2005 |
| 'Cool Hand Cam' | Schmidt, Bevie | Medium | Dark-Green | - | - | Unknown | - | - | --NR-- |
| 'Coquette' | Benedict, Dr Ralph (Herb) | Medium | Med-Green | Marginal | Creamy White | Hybrid | Light-Purple | August | .1987 |
| 'Cosmic Blue' | Livingston, Ron | Medium | Blue/Green | - | - | Hybrid | Med-Lavender | - | --NR-- |
| 'Country Gentleman' | Benedict, Dr Ralph (Herb) & Kuenster, Rod | Large | Blue/Green | Marginal | Yellow | Unknown | Near-White | June into July | .2010 |
| 'Cowabunga' | Asch, Stuart | Large | Light-Green | Marginal | White | Unknown | - | - | .2010 |
| 'Cowrie' | Walters Gardens | Medium | Dark-Green | Marginal | Yellow | TC Sport | Pale-Lavender | July into August | --NR-- |
| 'Creet wee esta' | Livingston, Ron | Small | Med-Green | - | - | Unknown | - | - | --NR-- |
| 'Crescent Moon' | Walters Gardens | Medium | Blue/Green | Marginal | White | Nat-Sport | Pale-Lavender | July into August | .1988 |
| 'Crested Surf' | Benedict, Dr Ralph (Herb) | Medium | Med-Green | Marginal | Creamy White | Hybrid | Light-Purple | August | .1990 |
| 'Crinkled Clink' | Livingston, Ron | Medium | Dark-Green | - | - | Unknown | Med-Lavender | July | --NR-- |
| 'Crocodile Rock' | Wilkins, Dr Jim | Large | Med-Green | - | - | Unknown | Deep-Purple | July into August | .2000 |
| 'Crocodile Smile' | Kulpa, John | Medium | Dark-Green | Medial | White | Unknown | Pale-Lavender | June into July | .2001 |
| 'Crown Jewel' | Walters Gardens | Miniature | Light-Green | Marginal | Yellow | Nat-Sport | Pale-Lavender | June into July | .1984 |
| 'Crowned Imperial' | Walters Gardens | Medium | Blue/Green | Marginal | White | Nat-Sport | Pale-Lavender | July into August | .1988 |
| 'Crowned Princess' | Englerth, Lawrence | - | - | - | - | Unknown | - | - | --NR-- |
| 'Crystal Charm' | Schmid, Tom | Small | Med-Green | Marginal | White | Unknown | Pale-Lavender | July into August | .2001 |
| 'Crystal Tiara' | Walters Gardens | Small | Yellow | Marginal | Green | Nat-Sport | Deep-Purple | July | .1998 |
| 'Cubby Bear' | Elslager, Ed | Small | Med-Green | Streaked | White | Hybrid | Pale-Lavender | August to October | .2000 |
| 'Cubra Libra' | Livingston, Ron | Large | Blue/Green | - | - | Unknown | - | - | --NR-- |
| 'Cupid's Arrow' | Walters Gardens | Small | Blue/Green | Marginal | White | TC Sport | Pale-Lavender | July | .1988 |
| 'Cupid's Dart' | Walters Gardens | Medium | Dark-Green | Marginal | White | Nat-Sport | Pale-Lavender | July | .1997 |
| 'Curious Yellow' | Livingston, Ron | Small | Yellow | - | - | Unknown | Light-Purple | - | --NR-- |
| 'Curlicue' | Elslager, Ed | Large | Med-Green | Streaked | Speckles | Hybrid | Pale-Lavender | June into July | .2001 |
| 'Curly Top' | Benedict, Dr Ralph (Herb) | Small | Med-Green | - | - | Hybrid | Light-Purple | August | .1985 |
| 'Curmudgeon' | Brown, Sandy | Medium | Med-Green | - | - | Unknown | - | June into July | .2010 |
| 'Curtain Call' | Wilkins, Dr Jim | Medium | Blue/Green | - | - | Nat-Sport | Light-Purple | July into August | .1998 |
| 'Curves' | Elslager, Ed | Medium | Med-Green | Marginal | Yellow | Hybrid | Med-Lavender | July into August | .2005 |
| 'Cutie' | Benedict, Dr R. (Herb) & Kuenster, Rod | Medium | Blue/Green | - | - | Unknown | Med-Lavender | August to October | .2010 |
| 'Cutie Pie' | Elslager, Ed | Small | Dark-Green | Streaked | Yellow | Hybrid | Med-Lavender | July into August | .2005 |
| 'Cutting Edge' | Benedict, Dr R. (Herb) & Gowen, Hideko | Large | Blue/Green | - | - | Hybrid | Pale-Lavender | July into August | .1999 |
| 'Cyberstar' | Elslager, Ed | Giant | Dark-Green | Marginal | White | Hybrid | Near-White | June into July | .2002 |
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