| Name? | Group? | Type? | Source? | Images? |
| 'Coelestine Superba' see ? |
Group 'Coelestine Superbum' | Belgian Indian | evg |
Galle85 |
| 'Coelestine Superbum' ('Coelestine Superba') | Indian | evg |
IRRC04 |
| 'Coelestine White' | Belgian Indian | evg |
Galle85 |
| 'Coerulescens' ('Caerulescens') | Ghent | dec |
IRRC04 |
| 'Coerulescens' ('Caerulescens') | Indian | evg |
IRRC04 |
| 'Coeruleum' | Indian | evg |
IRRC04 |
| 'Coe's Pink Beauty' | Belgian Indian | evg |
Galle85 |
| 'Coffee' | Ilam | dec |
Galle85 |
| 'Col. Alexander Hamilton' | Marlbank Farm | evg |
Galle85 |
| 'Colbertii' see 'Fred Colbert' | Aus. & NZ | evg |
Galle85 |
| 'Coleman's Candy' (Z12-1) | Cripple Creek | evg |
Galle85 |
| 'Coleman's Early Yellow' | Coleman | dec |
Galle85 |
| 'Coleman's Sunshine' ('Rushin's Austrinum') | Coleman | dec |
AmAz04 |
| 'Colin Kendrick' see 'Colin Kenrick' | Knap Hill | dec |
Galle85 |
| 'Colin Kenrick' ('Colin Kendrick') | Knap Hill | dec |
Galle87 |
| 'Col. John Laurens' | Marlbank Farm | evg |
Galle85 |
| 'Colleen' | Glenn Dale | evg | Galle85 | b, b |
| 'Colleen Becker' | Eden | evg |
Galle85 |
| 'Colleen Fahey' | Davidson | evg |
IRRC04 |
| 'Col. Mosby' | Dodd | dec |
Dodd04 |
| 'Colonel Alexander Hamilton' | Cole | evg |
IRRC04 |
| 'Colonel F. R. Durham' | Mollis | dec |
Galle85 |
| 'Colonel Hinckley' | Eden | evg |
IRRC04 |
| 'Colonel John Laurens' | Cole | evg |
IRRC04 |
| 'Colonel Pynaert' | Mollis | dec |
IRRC04 |
| 'Colonel Timothy Pickering' ('Col. Timothy Pickering') | Cole | evg |
IRRC04 |
| 'Colorado' | Chisolm-Merritt | evg |
Galle85 |
| 'Colorado' | Rutherford | evg |
Galle85 |
| 'Colorans' | Indian | evg |
IRRC04 |
| 'Coloratum' ('Nudiflora Colorata') | Ghent | dec |
IRRC04 |
| 'Coloratura' | Leach | dec |
Galle85 |
| 'Coloris Novi' | Indian | evg |
IRRC04 |
| 'Colossus' | Leach | dec |
Galle85 |
| 'Col. Timothy Pickering' see 'Colonel Timothy Pickering' | Marlbank Farm | evg |
Galle85 |
| 'Columba' | Indian | evg |
IRRC04 |
| 'Columba' | Kondratovics | evg |
IRRC04 |
| 'Columbia' | Chisolm-Merritt | evg |
Galle85 |
| 'Columbina' | Knap Hill | dec |
IRRC04 |
| 'Columbine' | Belgian Indian | evg |
Galle85 |
| 'Columbus' | Mollis | dec |
Galle87 |
| 'Colwell Pink' see 'Colwell's Pink' | Aus. & NZ | evg |
Galle85 |
| 'Colwell's Pink' ('Colwell Pink') | Aus. & NZ | evg |
IRRC04 |
| 'Colyer' | Kurume | evg |
Galle85 |
| 'Comanche' | Aus. & NZ | evg |
Galle85 |
| 'Comanche' | Southern Indian | evg |
Galle85 |
| 'Comble de Gloire' | Ghent | dec |
IRRC04 |
| 'Come Quickly' | Carlson | dec |
Galle85 |
| 'Come Running' | Carlson | dec |
Galle85 |
| 'Comet'1 | Indian | evg |
IRRC04 |
| 'Comet'2 | Indian | evg |
IRRC04 |
| 'Comet' | Beltsville | evg |
Galle85 |
| 'Comitessa Flandriae' see 'Comtesse de Flandre' | Ghent | dec |
IRRC04 |
| 'Commanche' | Ilam | dec |
Galle85 |
| 'Commando' | Glenn Dale | evg | Galle85 | b |
| 'Commercial' | Indian | evg |
IRRC04 |
| 'Commodore' | Glenn Dale | evg | Galle85 | b |
| 'Comosum' | Indian | evg |
IRRC04 |
| 'Compactum' | Wada | evg |
Galle85 |
| 'Comptonii' | Indian | evg |
IRRC04 |
| 'Comte Adrien de Germiny' | Indian | evg |
IRRC04 |
| 'Comte Baudouin' | Indian | evg |
IRRC04 |
| 'Comte Charles de Kerchove' see 'Comte Charles de Kerchove de Denterghem' ? | Belgian Indian | evg |
Galle85 |
| 'Comte Charles de Kerchove de Denterghem' ('Comte Charles de Kerchove', 'Count de Kerkov') | Indian | evg |
IRRC04 |
| 'Comte d'Argenteau' | | dec |
IRRC04 |
| 'Comte de Barras' | Marlbank Farm | evg |
Galle85 |
| 'Comte de Chambord' | Aus. & NZ | evg |
Galle85 |
| 'Comte de Flandre' | Ghent | dec |
Galle85 |
| 'Comte de Flandre' | Indian | evg |
IRRC04 |
| 'Comte d'Egmont' | Ghent | dec |
IRRC04 |
| 'Comte de Gomer' ('Consul Ceresole') | Mollis | dec |
Galle85 |
| 'Comte de Grasse' | Marlbank Farm | evg |
Galle85 |
| 'Comte de Hainaut' | Indian | evg |
IRRC04 |
| 'Comte de Keratone' ('Comte de Keretone') | Aus. & NZ | evg |
Galle85 |
| 'Comte de Kerchove' | Indian | evg |
IRRC04 |
| 'Comte de Kerchove' | Mollis | dec |
Galle85 |
| 'Comte de Keretone' see 'Comte de Keratone' | Aus. & NZ | evg |
IRRC04 |
| 'Comte de la Torre' | Aus. & NZ | evg |
Galle85 |
| 'Comte de Papadopoli' ('Comte Papadopoli') | Mollis | dec |
Galle85 |
| 'Comte de Paris'1 | Indian | evg |
IRRC04 |
| 'Comte de Paris'2 | Indian | evg |
IRRC04 |
| 'Comte de Paris' | Mollis | dec |
IRRC04 |
| 'Comte de Quincey' ('Comte de Quincy') | Mollis | dec |
IRRC04 |
| 'Comte de Quincy' see 'Comte de Quincey' | Mollis | dec |
Galle85 |
| 'Comte de Rochambeau' | Marlbank Farm | evg |
Galle85 |
| 'Comte de Thole' | Indian | evg |
IRRC04 |
| 'Comte Ernest Turati' | Ghent | dec |
IRRC04 |
| 'Comte Margaria' | Indian | evg |
IRRC04 |
| 'Comte Papadopoli' see 'Comte de Papadopoli' | Mollis | dec |
IRRC04 |
| 'Comtesse de Beaufort' | Ghent | dec |
IRRC04 |
| 'Comtesse de Beaufort' | Indian | evg |
IRRC04 |
| 'Comtesse de Chaumont-Quitry' | Indian | evg |
IRRC04 |
| 'Comtesse de Flandre' ('Comitessa Flandriae') | Ghent | dec |
IRRC04 |
| 'Comtesse de Flandre' | Indian | evg |
IRRC04 |
| 'Comtesse de Hainaut' | Indian | evg |
IRRC04 |
| 'Comtesse de Kerchove' ('R.G.N.') | Belgian Indian | evg |
Galle85 |
| 'Comtesse de Kerchove' | Mollis | dec |
Galle85 |
| 'Comtesse de Ribacourt' ('Comtesse de Ribencourt') | Indian | evg |
IRRC04 |
| 'Comtesse de Ribencourt' see 'Comtesse de Ribacourt' | Indian | evg |
IRRC04 |
| 'Comtesse de Saint-Cricq' ('Comtesse de Saint-Crieg') | Ghent | dec |
IRRC04 |
| 'Comtesse de Saint-Crieg' see 'Comtesse de Saint-Cricq' | Ghent | dec |
Galle87 |
| 'Comtesse du Maisniel' | Ghent | dec |
IRRC04 |
| 'Comtesse Eugenie' | Indian | evg |
IRRC04 |
| 'Comtesse Eugenie de Kerchove' | Southern Indian | evg |
Galle85 |
| 'Comtesse Vizthum' | Indian | evg |
IRRC04 |
| 'Con Amore' | Glenn Dale | evg | Galle85 | b |
| 'Concho' | Greenwood | evg |
Galle85 |
| 'Concinna' see 'Concinnum' | Aus. & NZ | evg |
Galle85 |
| 'Concinnum' | Ghent | dec |
IRRC04 |
| 'Concinnum' ('Concinna') | Indian | evg |
IRRC04 |
| 'Concinnum Novum' | Ghent | dec |
IRRC04 |
| 'Concolor' | Indian | evg |
IRRC04 |
| 'Concord Cemetery' | Intergroup | evg |
Galle87 |
| 'Concordia'1 | Indian | evg |
IRRC04 |
| 'Concordia'2 | Indian | evg |
IRRC04 |
| 'Concordia'3 | Indian | evg |
IRRC04 |
| 'Concordia' | Glenn Dale | evg | Galle85 | b |
| 'Confetti' | Greenwood | evg |
Galle85 |
| 'Congalla' see 'Cangallo' | Kurume | evg |
Galle85 |
| 'Congalo' see 'Cangallo' | Kurume | evg |
IRRC04 |
| 'Congo' see 'Robin Hill Congo' | Robin Hill | evg |
Galle85 |
| 'Conlea' ('Autumn Rouge') | Encore | evg |
JARS58:2 |
| 'Conleb' ('Autumn Embers') | Encore | evg |
JARS58:2 |
| 'Conlec' ('Autumn Royalty') | Encore | evg |
JARS58:2 |
| 'Conled' ('Autumn Coral') | Encore | evg |
JARS58:2 |
| 'Conlee' ('Autumn Amethyst') | Encore | evg |
JARS58:2 |
| 'Conlef' ('Autumn Cheer') | Encore | evg |
JARS58:2 |
| 'Conleg' ('Southern Flame') | Encore | evg |
JARS58:2 |
| 'Conlei' ('Southern Glory') | Encore | evg |
JARS58:2 |
| 'Conlej' ('Southern Beauty') | Encore | evg |
JARS58:2 |
| 'Conlek' ('Southern Blush') | Encore | evg |
JARS58:2 |
| 'Conlel' ('Southern Grace') | Encore | evg |
JARS58:2 |
| 'Conlem' ('Southern Maiden') | Encore | evg |
JARS58:2 |
| 'Connellesii' | Aus. & NZ | evg |
Galle85 |
| 'Connie' | Ten Oaks | evg |
Galle85 |
| 'Connie H' | Hollowell | dec |
IRRC04 |
| 'Conqueror' see 'Formosum' | Indian | evg |
IRRC04 |
| 'Conqueror' | Rutherford | evg |
Galle85 |
| 'Conquest' | Glenn Dale | evg | Galle85 | b |
| 'Consolation' | Glenn Dale | evg | Galle85 | b |
| 'Consolation' | Indian | evg |
IRRC04 |
| 'Conspicuum' | Ghent | dec |
IRRC04 |
| 'Conspicuum' | Indian | evg |
IRRC04 |
| 'Conspicuum Purpureum' see 'Arboreum Purpureum' | | evg |
IRRC04 |
| 'Constance' | Glenn Dale | evg | Galle85 | b |
| 'Constance' | Indian | evg |
IRRC04 |
| 'Constance' | Rutherford | evg |
Galle85 |
| 'Constance Burnett' | Girard | dec |
Galle85 |
| 'Constancy' | | unk |
IRRC04 |
| 'Constantia Rosea' | Indian | evg |
IRRC04 |
| 'Constant van Keirsbilck' see 'Constant van Keirsblik' | Indian | evg |
IRRC04 |
| 'Constant van Keirsblik' ('Constant van Keirsbilck') | Indian | evg |
IRRC04 |
| 'Consuela' | Glenn Dale | evg | Galle85 | b |
| 'Consul Ceresole' see 'Comte de Gomer' | Mollis | dec |
Galle85 |
| 'Consul Pecher' | Mollis | dec |
Galle85 |
| 'Content' | Glenn Dale | evg | Galle85 | b |
| 'Contortum' ('Calendulacea Contorta', 'Contosta') | | dec |
IRRC04 |
| 'Contosta' see 'Contortum' | | dec |
IRRC04 |
| 'Conversation Piece' ('Effie Bunce', T36-6) | Robin Hill | evg |
Galle85 |
| 'Cooperi' | Indian | evg |
IRRC04 |
| 'Coos' | Knap Hill | dec |
Galle85 |
| 'Copernicus' | Mollis | dec |
Galle87 |
| 'Copper Canyon' | Dodd | dec |
Dodd04 |
| 'Copper Cloud' see 'Ilam Copper Cloud' | Ilam | dec |
Galle85 |
| 'Copperman' | Glenn Dale | evg | Galle85 | b |
| 'Copper Queen' | Belgian Indian | evg |
Galle85 |
| 'Coquet' | Indian | evg |
IRRC04 |
| 'Coquette' | Glenn Dale | evg | Galle85 | b, b |
| 'Coquette' | Knap Hill | dec |
Galle85 |
| 'Coquette de Flandres' | Indian | evg |
IRRC04 |
| 'Coquette de Gand' | Indian | evg |
IRRC04 |
| 'Coquille' | Occidentale | dec |
Galle85 |
| 'Coquille' | Slonecker | dec |
Galle85 |
| 'Cora Brandt' | Back Acres | evg |
Galle85 |
| 'Coral Ace' | Back Acres | evg |
Galle85 |
| 'Coral Beauty' | Haworth-Booth | evg |
IRRC04 |
| 'Coral Bells' see 'Kirin' | Kurume | evg |
Galle85 |
| 'Coral Bell Supreme' | Kurume | evg |
Galle85 |
| 'Coral Cascade' see 'Bruce Hancock' | Harris | azd |
IRRC04 |
| 'Coral Cluster' | Chisolm-Merritt | evg |
Galle85 |
| 'Coral Day' | Loblolly Bay | evg |
Galle85 |
| 'Coral Delight' | Lewis | evg |
Galle85 |
| 'Coral Dogwood' | Intergroup | evg |
Galle85 |
| 'Coralie' | Coolidge | evg |
Galle85 |
| 'Coralie' | Glenn Dale | evg | Galle85 | b |
| 'Coral Ivory' see 'Tanima-no-yuki' | Indicum | evg |
Galle85 |
| 'Coral King' | Furman | dec |
IRRC04 |
| 'Corallinum' | Indian | evg |
IRRC04 |
| 'Coral May Queen' | Kerrigan | evg |
Galle85 |
| 'Coral Pearce' | | evg |
Tingle57 |
| 'Coral Queen' | KH-Pride | dec |
Galle85 |
| 'Coral Red' | KH-Pride | dec |
Galle85 |
| 'Coral Red' | Virginia Royalty | evg |
Galle85 |
| 'Coral Redwing' see 'Coral Redwings' | Belgian Indian | evg |
Galle85 |
| 'Coral Redwings' ('Coral Redwing') | Indian | evg |
IRRC04 |
| 'Coral Reef' | Aromi | dec | Azalean25:2 | b |
| 'Coral Sands' | Carlson-Abbott | dec |
Galle85 |
| 'Coral Sea' | Chisolm-Merritt | evg |
Galle85 |
| 'Coral Sea' | Glenn Dale | evg | Galle85 | b |
| 'Coral Wing' | | evg |
IRRC04 |
| 'Corbella' see 'Gorbella' | Wuyts | evg |
IRRC04 |
| 'Cordial' | Glenn Dale | evg | Galle85 | b |
| 'Cordon Bleu' | Hazlewood | unk |
IRRC04 |
| 'Cordor' | Ghent | dec |
IRRC04 |
| 'Corinna Borden' | North Tisbury | evg |
Galle85 |
| 'Corinne Murrah' ('Corrine Murrah') | Back Acres | evg |
Galle85 |
| Cork Azalea see quinquefolium | Species | dec |
Galle85 |
| 'Cornation Lady' see 'Coronation Lady' | Knap Hill | dec |
Galle87 |
| 'Corneille' | Ghent | dec |
Galle85 |
| 'Cornelia' | Chisolm-Merritt | evg |
Galle85 |
| 'Cornelia' | Indian | evg |
IRRC04 |
| 'Cornelia van Herden' see 'Flander's Field' | Pericat | evg |
Galle85 |
| 'Cornelia van Tol' | Mollis | dec |
IRRC04 |
| 'Cornelis Esveld' see 'C. Esveld' | Mollis | dec |
IRRC04 |
| 'Cornelius' | Indian | evg |
IRRC04 |
| 'Cornellius Esveld' see 'C. Esveld' | Mollis | dec |
IRRC04 |
| 'Cornellus Esveld' see 'C. Esveld' | Mollis | dec |
IRRC04 |
| 'Corner' see 'Janny' | Hershey | evg |
Galle85 |
| 'Corn Husker' | Tolstead | evg |
IRRC04 |
| 'Cornish Glow' | Bolitho | unk |
IRRC04 |
| 'Corona' | Indian | evg |
IRRC04 |
| 'Coronado Cascade' | Harris | evg |
IRRC04 |
| 'Coronarium' | Ghent | dec |
IRRC04 |
| 'Coronarium Grandiflorum' | Indian | evg |
IRRC04 |
| 'Coronation' | Aus. & NZ | evg |
Galle85 |
| 'Coronation' | Knap Hill | dec |
IRRC04 |
| 'Coronation Lady' ('Cornation Lady') | Knap Hill | dec |
Galle85 |
| 'Coronatum' | | dec |
IRRC04 |