| Hostaname | RG | SZ | Leaf color | P | F | Origin |
| H. 'Cadillac' E. Skrocki/T. Avent 1998 | R | M | goy,dgre | | | unknown |
| H. 'Caesar' A. Malloy 1999 | R | | str,gr,w,ble | | | 'Gold Standard' sport |
| H. 'Caesar Salad' Tony Avent 2007 | R | | gr | | | ('Korean Snow' x 'Maekawa') x 'Elvis Lives' |
| H. 'Cajun Sunrise' Ed Elslager 2000 | R | | str,gr,go,cr | STR | | 'Sea Prize' x 'Maekawa' |
| H. 'Calamity Jane' Stephen Nyikos 2001 | R | | gr,str,y | | Y | 'William Lachman' x plantaginea |
| H. 'Calypso' William and Eleanor Lachman 1987 | R | S | crw,dgre | | | "hybrid" x 'White Christmas' |
| H. 'Camelot' Eric B. Smith/BHHS 1988 | R | M | bl | | | tardiflora x sieboldiana 'Elegans' |
| H. 'Cameo' H. Hansen/Shady Oaks 2002 | R | D | gr,we | | | 'Baby Bunting' sport |
| H. 'Canadian Foreign Affairs' Ken Knechtel/P. Ruh 2002 | R | L | gr | | | unknown |
| H. 'Canadian Shield' Ken Knechtel 1993 | R | M | gr | | | 'Halcyon' sport |
| H. 'Canby' C. Tompkins/P. & J. Ruh 2003 | R | | gr,lgre | | | unknown |
| H. 'Candle Glow' Fairway Enterprises 1990 | R | M | str,ch,cr,y | | | 'Fascination' hybrid |
| H. 'Candle Wax' Eldren W. Minks 1974 | R | M | gr | | | unknown |
| H. 'Candlelight' D. & J. Ward 2005 | R | | goy | | | 'White Vision' seedling |
| H. 'Candlewood' P. Banyai/S. Asch 2004 | R | | gr | | | unknown |
| H. 'Candy Cane' P. Banyai/Elslager 1995 | R | SM | dgr,ye | | | unknown |
| H. 'Candy Dish' Alex Summers/A. Wrede 2003 | R | S | dgr | PUD | | 'Urajiro Hachijo' hybrid |
| H. 'Candy Hearts' Eunice Fisher 1971/Peter Ruh 1998 | R | M | blgr>gr | | | nakaiana hybrid |
| H. 'Candy Striper' R. Woodford 2000 | R | | str,gr,cr,w | STR | | 'Fortunei Hyacinthina' sport |
| H. 'Cantabi' S. Hirao/P. & J. Ruh 2001 | R | | gr | | | unknown |
| H. 'Canterbury Tales' Alex Malloy 2002 | R | S | str,dblgr,crw | | | 'Chivalry' sport |
| H. 'Capitol Dome' Eldren W. Minks 1980 | R | | | | | 'Crested Reef' x 'Crinkle Cup' |
| H. 'Capitol Hill' Tony Avent 2005 | R | | dgr,lgre | | | 'Potomac Pride' sport |
| H. 'Captain Atom' Alex Malloy 1999 | R | | str,w,gr | | | 'Surprised by Joy' sport |
| H. 'Captain Kirk' Kirk Brill 1999 | R | M | ly,dgre | | | 'Gold Standard' sport |
| H. 'Captain Teach' H. Sugita/P. Ruh/P. & J. Ruh 2001 | R | | dgr | | | kikutii var. caput-avis hybrid |
| H. 'Carder Blue' Ellen Carder/Summers/AHS 1986 | R | M | blgr | | | 'Tokudama' hybrid |
| H. 'Cardwell Yellow' Gus Krossa/Peter Ruh 1981 | R | ML | y | | | unknown |
| H. 'Carefree' Eunice V. Fisher 1971 | R | | ly>dgr | | | 'Golden Anniversary' hybrid |
| H. 'Carisa Nichole' I. Byrd 2000 | R | | blgr,goe | | | 'Christmas Tree' hybrid |
| H. 'Carl' Carl Calderara/Peter Ruh 1991 | R | SM | blgr | | | unknown |
| H. 'Carl A. Francis' C. Francis/S. Chamberlain 2004 | R | S | goy,gre | | | "green seedling" sport |
| H. 'Carnival' William and Eleanor Lachman 1986 | R | ML | dgr,str,ye | | | (x 'Beatrice') x (x 'Frances Williams') |
| H. 'Carol' Frances Williams/AHS 1986 | R | ML | dgr,vwe | | | 'Fortunei' sport |
| H. 'Carolina Blue' R. Solberg 2000 | R | M | blgr | | | 'Halcyon' x 'Riptide' |
| H. 'Carolina Moon' A. Breiwick 1997 | R | | gr,che | | | 'August Moon' sport |
| H. 'Carolina Sunshine' T. Avent 1999 | R | M | dgr,goye | | | 'Swoosh' x tibae |
| H. 'Carolingian' Alex Malloy 2003 | R | D | gr,we | | | 'Captain Atom' hybrid |
| H. 'Carousel' William and Eleanor Lachman 1989 | R | SM | dgr,ye | | | "seedling" x 'Reversed' |
| H. 'Carrie Ann' David Stone/Peter Ruh 1988 | R | M | gr,ywe | | | sieboldii sport |
| H. 'Cartwheels' A. Summers/P. & J. Ruh 2002 | R | ML | blgr,ye | | | 'Golden Nugget' sport |
| H. 'Cascades' William & Eleanor Lachman 1993 | R | ML | wc,blgre | | | 'Banana Sundae' x montana 'Aureomarginata' |
| H. 'Cascading Waters' Don Dean 2005 | R | | gr,gagre | | | 'Liberty Bell' x hypoleuca |
| H. 'Cassandra' Wally Wagner 1985 | R | DS | y | | | 'Petite Gold' x 'Piedmont Gold' |
| H. 'Cat and Mouse' Hans Hansen/Shady Oaks 2007 | R | D | ch,blgre | | | 'Blue Mouse Ears' sport |
| H. 'Cat's Meow' C. Falstad 1998 | R | M | gr,ye | | | 'Tokudama Flavocircinalis' sport |
| H. 'Cathedral' Alex Malloy 2002 | R | | gr,str,cr,y,we | | | 'Zager's White Edge' sport |
| H. 'Cathedral of Learning' S. & S. Zolock 2007 | R | | gr | | | "seedling" x "seedling" |
| H. 'Cathedral Windows' Hans Hansen 2005 | R | L | goy,dgre | | Y+ | 'Stained Glass' sport |
| H. 'Catherine Ann' F. Nyikos 1999 | R | M | blgr | | | unknown x 'Blue Dimples' |
| H. 'Cavalcade' William & Eleanor Lachman 1990 | R | ML | dgr,lwe | | | 'Flamboyant' selfed |
| H. 'Celebration' Paul Aden 1978 | R | S | cr,gre | | | 'Aden 378' x 'Aden 322' |
| H. 'Celebrity' William & Eleanor Lachman 1995 | R | L | dgr,ye | | | 'Beatrice F6' x 'Frances Williams' |
| H. 'Celery Satin' R. Snyder 2001 | R | | gry | | | 'My Secret' sport |
| H. 'Celestial' E. Elslager 2000 | R | L | dgr,crwe | | | 'Dorothy Benedict' x hypoleuca |
| H. 'Celestial Lightning' Ed Elslager 2005 | R | | gr,str,y,cr | | | 'Celestial' sport |
| H. 'Celtic Uplands' Don Dean 2005 | R | | dgr | R | | ((x 'Swoosh') x 'John Wargo') x yingeri |
| H. 'Centennial' Dick & J. Ward 1996 | R | XL | blgr>dgr | | | unknown |
| H. 'Center of Attention' J. Kulpa 1999 | R | M | (y>cr)c,gr | | | 'Sea Prize' hybrid |
| H. 'Center Stage' Kevin C. Vaughn 1982 | R | SM | crw,gre | | | "seedling" x "seedling" |
| H. 'Centerfold' Gayle O. Kamp 1994 | R | L | ch>goy | | | unknown |
| H. 'Century One' Steve C. Moldovan 1983 | R | XL | lgr | | | sieboldiana hybrid |
| H. 'Chado' G. Johnson 2004 | R | M | gr,str,cr | | | 'Iron Gate Supreme' x pycnophylla |
| H. 'Chain Lightning' D. & J. Ward 1999 | R | | crw,dgre | | | (x 'Pin Stripe Sister') hybrid |
| H. 'Chalice of Gold' Ed Elslager 2004 | R | L | goy | | | 'Sea Prize' seedling |
| H. 'Challenger' Eunice V. Fisher 1971 | R | ML | chgr | | | unknown |
| H. 'Chameleon' Caprice Farm Nursery 1986 | R | ML | dgr,we | | | unknown |
| H. 'Champagne' Robert P. Savory 1994 | R | DS | ygr,dgre | | | 'Ogon Koba' hybrid |
| H. 'Champagne and Caviar' C. Helsley 1999 | R | | str,dgr,w | | | 'Tea and Crumpets' sport |
| H. 'Champion' Marge Soules 1985 | R | XL | gagr | | | sieboldiana x 'Tokudama' |
| H. 'Change of Tradition' Mark Zilis/T&Z Nursery 1985 | R | ML | gr,nawe | | | 'Lancifolia' sport |
| H. 'Changeling' A. Pollock 2005 | R | | gr,(goy>gr)e | | | unknown |
| H. 'Changing Moods' Kevin C. Vaughn 1983 | R | S | y>cr | | | 'Janet' x (x 'William Lachman') |
| H. 'Chante's Dark Emerald' Blue Jean Farms/Lukehart & Miskolcze 2005 | R | | dgr,spe,go,gr | | | 'Gold Standard' sport |
| H. 'Chantilly Lace' William and Eleanor Lachman 1988 | R | SM | blgr,we | | | 'Calypso' x 'Halcyon' |
| H. 'Chariots of Fire' J. Dishon/A. Malloy 2004 | R | M | lgr,we | R | | ('Beatrice' x 'Garnet Prince') x pycnophylla |
| H. 'Chartreuse' Gladys Holly 1968/E. Fisher/Peter Ruh 1998 | R | M | ch>gr | | | unknown |
| H. 'Chartreuse Piecrust' Clarence Owens 1985 | R | M | y | | | 'Bengee' hybrid |
| H. 'Chartreuse Wedge' Paul Aden 1976 | R | ML | ch | | | 'Green Wedge' selfed |
| H. 'Chartreuse Wiggles' Paul Aden 1976 | R | D | ych | | | 'Wogon' hybrid |
| H. 'Cheatin Heart' Bill Zumbar 1995 | R | D | ch>goy | | | "Subcrocea cross F2" x 'Birchwood Gem' |
| H. 'Chelsea Babe' BHHS 1988 | R | SM | ly>gr,gre | | | 'Fortunei Albopicta' sport |
| H. 'Chelsea Ore' Chelsea Physic Garden/Compton 1989 | R | L | ygr>y,dgre | | Y+ | plantaginea sport or hybrid |
| H. 'Cherish' H. Hansen/Shady Oaks 2002 | R | DS | (y>w)c,gre | | | 'Baby Bunting' sport |
| H. 'Cherries Jubilee' Alex Malloy 2001 | R | SM | str,gr,w | | | 'Cherry Berry' sport |
| H. 'Cherry Berry' William and Eleanor Lachman 1991 | R | SM | w,dgre | R | | 'Lachman 82-18-1' x 'Lachman 81-9-2' |
| H. 'Cherry Bomb' G. Johnson 2004 | R | D | crw,gre | RB | | 'Little Wonder' seedling |
| H. 'Cherub' William and Eleanor Lachman 1989 | R | MS | gr,cre | | | 'Crepe Suzette' x 'Blue Moon' |
| H. 'Chesapeake Bay' Olga Petryszyn 2004 | R | L | bl | | | ('Maui Rains' x 'Blue Arrow') x 'Blue Betty Lou' |
| H. 'Chesieres Green Christmas' L. Hirsbrunner 2002 | R | | gr,cre | | | 'Christmas Tree' sport |
| H. 'Chesieres Jasmin's Hope' L. Hirsbrunner 2002 | R | | blgr | | | 'Blue Angel' sport |
| H. 'Chesieres Mountain Lights' L. Hirsbrunner 2002 | R | | ly,gre | | | 'Richland Gold' sport |
| H. 'Chesieres September Frost' L. Hirsbrunner 2002 | R | | blgr,we | | | 'Frosted Jade' sport |
| H. 'Chesterland Gold' M. Zilis/P. Ruh 1997 | R | SM | y>ch | | | 'Paul's Glory' sport |
| H. 'Chief White Cloud' B. & D. Stegeman/Van Wade 2007 | R | | blgr | | | pycnophylla x ('High Noon' x 'Big John') |
| H. 'Childhood Sweetheart' Hans Hansen 2005 | R | | dgr,crwe | | | ('Neat Splash' x 'Tardiflora') x 'Shining Tot' |
| H. 'China Doll' Robert P. Savory 1988 | R | S | ch | | | 'August Moon' hybrid |
| H. 'Chinese Sunrise' R. Schaeffer/A. Summers/P. Ruh 1992 | R | SM | ch>gr,dgre | | | cathayana sport |
| H. 'Chippewa' Arett/AHS 1986 | R | | y,gre | | | sieboldiana sport |
| H. 'Chiquita' Mervin C. Eisel 1979 | R | ML | ly>gr | | | unknown |
| H. 'Chivalry' Alex Malloy 2001 | R | S | dblgr | | | 'Flamboyant' x 'Metallica' |
| H. 'Choctaw' Van Wade 2007 | R | | blgr | | | 'Creek' x 'Sea Blue Leather' |
| H. 'Chodai Ginba' Kajigawa/Gotemba Nursery/P. & J. Ruh 2003 | R | | dgr | | | unknown |
| H. 'Choo Choo Train' T. Sears/T. Avent 1999 | R | L | gry | | | unknown |
| H. 'Christmas Candy' D. van Erven/D. Van Eechaute/G. van Eyk-Bos 2002 | R | | w,gre | | | 'Night before Christmas' sport |
| H. 'Christmas Charm' Mark Zilis 2003 | R | M | dgr,crwe | | | 'Night before Christmas' sport |
| H. 'Christmas Cookies' M. Zilis/R. Solberg 2003 | R | | w,dgre | | | 'Night before Christmas' sport |
| H. 'Christmas Cup' Stuart Asch 2000 | R | | dgr | STR | | 'Christmas Tree' hybrid |
| H. 'Christmas Pageant' Mike Pinterics 2000 | R | | dgr,cre | | | 'Christmas Tree' sport |
| H. 'Christmas Tree' Kevin C. Vaughn/Mildred Seaver 1982 | R | ML | gr,crwe | | | "Vaughn 73-2" x 'Frances Williams' |
| H. 'Christmas Tree Gala' Loleta Powell 2000 | R | ML | str,gr,cry | | | 'Christmas Tree' sport |
| H. 'Chutzpah' Alex Malloy 2002 | R | M | str,gry | | | 'Anglo Saxon' hybrid |
| H. 'Cinderella' M. Zilis/J. & K. Schwarz 2004 | R | M | dgr,goye | | | 'Dorothy Benedict' selfed |
| H. 'Circle of Light' Kevin Walek 1996 | R | S | gr,we | | | 'Galaxy' x 'Little White Lines' |
| H. 'Circus Clown' Eldren W. Minks 1983 | R | ML | gr | | | 'Ruffles' x 'Green Piecrust' |
| H. 'Citation' Paul Aden 1980 | R | SM | ygr,cre | | | 'Vicky Aden' hybrid |
| H. 'City Lights' Paul Aden 1978 | R | ML | y | | | 'White Vision' x 'Golden Prayers' |
| H. 'City Slicker' Jim Dishon 1996 | R | M | dgr,(y>cr)e | | | 'Yellow Splash' x yingeri |
| H. 'Clambake' G. Goodwin 2000 | R | | lgr | | | hypoleuca hybrid |
| H. 'Clarence' Lucille Simpers/Marjorie Soules 1996 | R | M | bl | | | sieboldiana hybrid |
| H. 'Clarence Owens' J. Kulpa 2001 | R | | goy,dgre | | | 'Lucky Fifty' hybrid |
| H. 'Classic Delight' Eunice V. Fisher 1973 | R | L | gagr | | | 'Green Piecrust' hybrid |
| H. 'Clayton Burkey' C. Burkley/S. & S. Zolock 2005 | R | | blgr | | | unknown |
| H. 'Clear Fork River Valley' Van Wade 2007 | R | L | blgr | | | 'Puckered Giant' x 'Woodland Blue' |
| H. 'Clearfork Green' Van Wade 1999 | R | | lgr | | | unknown |
| H. 'Clementine' Jim Huseman/E. Schulz 2007 | R | | lgr | R | | 'My Darling' seedling |
| H. 'Clifford's Broken Heart' J. Clifford 2000 | R | | gr,(wspegr)e | | | 'Loyalist' sport |
| H. 'Clifford's Comet' John Clifford 2000 | R | | wspegr,gre | | | 'Loyalist' sport |
| H. 'Clifford's Forest Fire' John Clifford 2000 | R | | blgr,ye | | | 'Sagae' sport |
| H. 'Clifford's Polar Moon' J. Clifford 2000 | R | | goy,gre | | | 'September Sun' sport |
| H. 'Clifford's Stingray' John Clifford 2000 | R | | w,gre | | | 'Loyalist' sport |
| H. 'Climax' Gil Jones 2000 | R | | gr,goe | | | 'High Noon' sport |
| H. 'Cloud Sweeper' S. & S. Zolock 2003 | R | | gr | | | 'Tall Boy' hybrid |
| H. 'Cloudburst' Doug Beilstein/Mark Zilis 2006 | R | M | blgr | | | 'Glory' seedling |
| H. 'Clouded Skies' Tony Avent 2007 | R | | blgr | | | 'Fragrant Blue' x ('Korean Snow' x 'Maekawa') |
| H. 'Clovelly' Kent Terpening 2005 | R | ML | gr | | | 'Split Decision' selfed |
| H. 'Clown's Collar' D. Dean 2004 | R | | blgr,lye | | | 'Dorset Clown' sport |
| H. 'Clyde Crockett' Patsy Stygall 2007 | R | | blgr,cre | | | 'Brenda's Choice' selfed |
| H. 'Coconut Custard' Bob Solberg 2007 | R | | y | | | ('Blue Cadet' x 'One Man's Treasure') seedling |
| H. 'Cody' R. Solberg 1996 | R | D | dgr | | | 'Shining Tot' x venusta |
| H. 'Cogleywood' J. Shugart/M. Crowl/L. Hansen 1999 | R | | spe,w,gr,dgre | | | unknown |
| H. 'Colesburg Blue' Bob Hackbarth 2004 | R | M | blgr | | | 'Tokudama' sport |
| H. 'Colonel Murphy' Steve & Sarah Zolock 2001 | R | | blgr | | | unknown |
| H. 'Color a la Mode' Ed Elslager 2000 | R | | str,cr,gry,gr,dgre | | | 'Color Fantasy' x hypoleuca |
| H. 'Color Accord' Paul Aden 1982 | R | M | str,gr,y,ch | | | 'Fascination' hybrid |
| H. 'Color Fantasy' Paul Aden 1980 | R | SM | str,gr,ch,cr | | | 'Gala' hybrid |
| H. 'Color Festival' Danny Van Eechaute 2007 | R | | crw,dgre | | | 'Enterprise' sport |
| H. 'Color Glory ' Paul Aden 1980 | R | L | str,grw,gre | | | 'Fascination' x 'Intrigue' |
| H. 'Color Parade' M. Zilis 2003 | R | SM | str,gr,y,w,che | | Y | 'Fragrant Bouquet' sport |
| H. 'Colorado River' Doug Beilstein/Alex Malloy 2005 | R | M | dgr | PU | | 'Neat Splash' x 'Riptide' |
| H. 'Colossal' Robert P. Savory 1977 | R | VL | dgr | | | unknown |
| H. 'Comeuppance' Paul Aden 1982 | R | M | str,y,ch,blgr | | | 'Vicki Aden' x 'Fascination' |
| H. 'Compass Point' C. Seaver 2004 | R | M | dgr,str,y,cr | | | unknown |
| H. 'Con Te Partiro' G. Johnson 2004 | R | S | blgr,crwe | | | ('Little Wonder' selfed) x 'Blue Moon' |
| H. 'Concord' R. Lydell 2000 | R | M | dgr | R | | 'Nangoku' hybrid |
| H. 'Concordia Petite' Ursula Syre-Herz 1996 | R | D | dgr | | | venusta x 'Golden Tiara' |
| H. 'Condor' H. Sugita/R. Lydell/P. & J. Ruh 2002 | R | M | go>gr | R | | longipes x pycnophylla |
| H. 'Confused' R. Beal 1999 | R | | str,w,gr,gre | | | 'Fortunei Hyacinthina' sport |
| H. 'Confused Angel' Danny Van Eechaute 2005 | R | | blgr,str,cr | | | 'Blue Angel' sport |
| H. 'Connecticut River' Doug Beilstein/Alex Malloy 2005 | R | | blgr | PU | | 'Harvest Dandy' x 'Blue Blush' |
| H. 'Connie' Ralph H. Benedict 1987 | R | | lgr,ye | | | ('Sunlight' sport) x ('Frances Williams' sport) |
| H. 'Connie Sun' R.Snyder 2001 | R | | y | | | 'Sunshine Glory' sport |
| H. 'Cookie Crumbs' M. Zilis/R. Solberg 2002 | R | D | gr,we | | | 'Tiny Tears' sport |
| H. 'Cool Cat' Ed Elslager2005 | R | | blgr,str,gr,gry | | | 'Foxy Cat' sport |
| H. 'Cool Change' Bob Kuk 1995 | R | L | bl | | | sieboldiana hybrid |
| H. 'Coquette' Ralph H. Benedict 1987 | R | SM | gr,che | | | 'Neat Splash' selfed |
| H. 'Cordelia' Bob Kuk 1991 | R | SM | dgr,cre | | | 'Neat Splash' hybrid |
| H. 'Corduroy' Steve C. Moldovan 1983 | R | XL | dgr | | | 'Green Acres' hybrid |
| H. 'Corkscrew' R. Solberg 2003 | R | S | dgr | PU | | 'Tortifrons' x 'One Man's Treasure' |
| H. 'Corona' G. Braun-Nauerz/P. Warmerdam 1996 | R | XL | gr,ye | | | 'Sum and Substance' sport |
| H. 'Coronation' Randy Goodwin 2006 | R | | blgr,lye | | | |
| H. 'Cory's Beauty' R. Cory 2004 | R | | bl,we | | | 'Blue Mammoth' sport |
| H. 'Cosmic Brother' Rod Kuenster 2006 | R | | gr,ly | | | |
| H. 'Cosmic Hippie' Rod Kuenster 2006 | R | | str,gry,crw | | | |
| H. 'Cosmic Sister' Rod Kuenster 2006 | R | | str,grw,gry | | | |
| H. 'Cotillion' William W. Zumbar 1995 | R | S | gr,cre | | | (x 'Breeders Choice') x (nakaiana x 'Kii Hime') |
| H. 'Count Dracula' Clyde Crockett 1997 | R | | dgr | | | unknown |
| H. 'Counter Point' Paul Aden 1982 | R | ML | str,blgr,y,we | | | 'Francee' sport or hybrid |
| H. 'Country Mouse' Hans Hansen/Shady Oaks 2007 | R | D | blgr,we | | | 'Bill Dress's Blue' sport |
| H. 'Country Road' D. Dean 2000 | R | | dgr | | | 'Rocky Road' hybrid |
| H. 'County Park' Grounds/Graham Hutchins 1983 | R | M | gr | | | unknown |
| H. 'Courtesy' M. Zilis/W. Zumbar 2003 | R | | gr | | | 'Sum and Substance' x (x venusta) |
| H. 'Cracker Crumbs' R. Solberg 2002 | R | D | y,dgre | | | 'Shiny Penny' sport |
| H. 'Craig Harlequin Bells' J. Craig/A. Summers/P. Ruh 1998 | R | SM | dgr | | | unknown |
| H. 'Craig's Temptation' Japan/J. Craig & G. Schenk/P. Ruh 2002 | R | S | dgr | | | venusta hybrid |
| H. 'Crater Lake' R. Snyder 1996 | R | VL | blgr | | | 'Elegans' hybrid |
| H. 'Cream Cheese' William and Eleanor Lachman 1991 | R | S | gr,we | | | 'Crepe Suzette' selfed |
| H. 'Cree' Van Wade 2007 | R | | gr | | | montana 'Aureomarginata' x 'Sea Drift' |
| H. 'Creek' Van Wade 2007 | R | | blgr | | | 'Sea Blue Leather' selfed |
| H. 'Crème Brûlée' G. Johnson 2004 | R | M | gr,grye | | | 'Sparkling Burgundy' sport |
| H. 'Crème Solaire' E. & J. Deckert 2004 | R | SM | gry | | | unknown |
| H. 'Crepe Suzette' William and Eleanor Lachman 1986 | R | DS | gr,cre | | | 'Flamboyant' hybrid |
| H. 'Crescendo' G. Kamp 2001 | R | | blgr | | | 'Sagae' hybrid |
| H. 'Crescent Moon' Walters Gardens 1988 | R | M | gr,we | | | 'Lunar Eclipse' sport |
| H. 'Crested Reef' Eldren W. Minks 1975 | R | ML | gr | | | 'August Moon' x 'Ruffles' |
| H. 'Crested Surf' Ralph & Dorothy Benedict 1990 | R | DS | gr,cre | | | 'Neat Splash' selfed |
| H. 'Crickett Bailedout' C. Bailey 2007 | R | | dgr | | | 'Sum and Substance' sport |
| H. 'Crinkle Cup' Eunice V. Fisher 1971 | R | ML | y>gr | | | 'Golden Anniversary' seedling |
| H. 'Crinoline Petticoats' Clarence Soules 1990 | R | L | blgr | | | sieboldiana x 'Tokudama' |
| H. 'Crispula' F. Maekawa/W. G. Schmid/AHS 2001 | R | ML | gr,we | | | montana? hybrid? |
| H. 'Crocodile Rock' S. Wilkins/J. Wilkins 2000 | R | L | lgr | | | unknown |
| H. 'Crocodile Smile' J. Kulpa 2001 | R | | crw,dgre | | | unknown |
| H. 'Cross Stitch' W. Zumbar/P. Ruh 1992 | R | ML | lgr | | | "T4401" x "T4402" |
| H. 'Crossroads Bling Bling' T. England 2003 | R | M | y,blgre | | | 'Crossroads Hurricane' sport |
| H. 'Crossroads Budgie' T. England 2003 | R | S | blgr | | | 'William Lachman' hybrid |
| H. 'Crossroads Hurricane' T. England 2003 | R | M | str,blgr,y | | | 'William Lachman' hybrid |
| H. 'Crossroads Oscar' T. England 2003 | R | S | gr,cre | | | 'William Lachman' hybrid |
| H. 'Crossroads Parrot' T. England 2003 | R | | gr | | | 'William Lachman' hybrid |
| H. 'Crossroads Rowdy' T. England 2003 | R | | gr,crwe | | | 'William Lachman' hybrid |
| H. 'Crossroads Steve' T. England 2003 | R | | gr,lye | | | 'William Lachman' hybrid |
| H. 'Crossroads Whirlpool' T. England 2003 | R | M | str,blgr,w | | | 'William Lachman' hybrid |
| H. 'Croutons' Mark Zilis/Bob Solberg 2003 | R | D | str,gr,cr | | | 'Tiny Tears' sport |
| H. 'Crow's Nest' Charles R. Seaver 1995 | R | SM | gr,cre | | | 'Don Stevens' x 'Sea Angel' |
| H. 'Crown Jewel' Walters Gardens 1984 | R | DS | ch,we | | | 'Gold Drop' sport |
| H. 'Crown Prince' Henry Ross/Peter Ruh 1987 | R | SM | str,y>ch | | | unknown |
| H. 'Crown Royalty' Fairway Enterprises 1990 | R | M | gr,che | | | 'Carol' x 'Fortunei Aureomarginata' |
| H. 'Crowned Imperial' Walters Gardens 1988 | R | ML | blgr,cre | | | 'Fortunei Hyacinthina' sport |
| H. 'Crumples' Diane Grenfell 1996 | R | SM | gr | | | sieboldiana 'Elegans' hybrid |
| H. 'Crusader' William and Eleanor Lachman 1989 | R | M | blgr,we | | | ('Resonance' x 'P14-3') x 'Halcyon' |
| H. 'Cry Baby' L. Jones 1999 | R | | gry,dgre | | | 'Anne Arett' hybrid |
| H. 'Crystal Charm' E. Lachman/T. Schmid 2001 | R | S | gr,we | | | unknown |
| H. 'Crystal Chimes' J. Springer 2000 | R | | dgr | | | yingeri hybrid |
| H. 'Crystal Fountain' B. Banyai 1999 | R | | y | | | ventricosa sport |
| H. 'Crystal Glaze' L. Simpers/P. Banyai/B. Banyai 2000 | R | | gr>y | | | montana hybrid |
| H. 'Crystal Moon' A. Tower/Tower Perennial Gardens 2002 | R | | lgr,cre | | Y | 'August Moon' sport |
| H. 'Crystal Tiara' Walters Gardens 1998 | R | S | w,ygre | | | 'Grand Tiara' sport |
| H. 'Cubby Bear' E. Elslager 2000 | R | D | str,gr,cr | STR | | 'Neat Splash' x 'Halcyon' |
| H. 'Cupid's Arrow' Walters Gardens 1988 | R | SM | w,dgre | | | 'Candy Hearts' sport |
| H. 'Cupid's Dart' Walters Gardens 1997 | R | S | dgr,we | | | 'Heartsong' sport |
| H. 'Curlew' Eric B. Smith/BHHS 1988 | R | M | blgr | | | tardiflora x sieboldiana 'Elegans' |
| H. 'Curlicue' E. Elslager 2001 | R | | str,gr,y | | | 'William Lachman' x 'Maekawa' |
| H. 'Curls' Fairway Enterprises/Minks 1990 | R | SM | gr | | | 'Tall Twister' x 'Circus Clown' |
| H. 'Curly' Eleanor and William Lachman 1991 | R | S | wc,dgr | RR | | 'Resonance' x 'White Christmas' |
| H. 'Curly Locks' William and Eleanor Lachman 1989 | R | SM | gr,we | | | 'Lachman 82-18' hybrid |
| H. 'Curly Top' Ralph H. Benedict 1985 | R | SM | gr | | | 'Ginko Craig' x plantaginea |
| H. 'Curtain Call' J. Wilkins 1998 | R | M | blgr | | | 'Wolverine' sport |
| H. 'Curves' Ed Elslager 2005 | R | | dgr,crye | | | (x 'Sea Prize') seedling |
| H. 'Cutie Pie' Ed Elslager 2005 | R | | dgr,str,y,crw | STR | | (x 'William Lachman') seedling |
| H. 'Cutting Edge' H. Gowen, R. Benedict 1999 | R | | blgr | | | 'Salute' x pycnophylla |
| H. 'Cyberstar' E. Elslager 2002 | R | | dgre,str,y,w | | | 'Sea Prize' hybrid |
| H. 'Cyclone' J. Schwarz 2002 | R | | crw,dgre | | | 'Whirlwind' sport |
| H. 'Cyclops' Rachel Soucek/John Soucek 2005 | R | G | blgr | | | unknown |
| H. 'Cynthia' Chet W. Tompkins 1984 | R | L | mot,yblgr>gr,y | | | montana hybrid |