• Allia Strelzov, 1973 accepted as Aricidea (Strelzovia) Aguirrezabalaga, 2012
• Ballia Harvey, 1840
• Cacalia Burm. (uncertain > unassessed)
• Cacalia L. accepted as Adenostyles Cass.
• Calafia Carvacho, 1983 accepted as Gnathostenetroides Amar, 1957
• Calais DC. accepted as Microseris D.Don
• Calais H. Woodward, 1896 † accepted as Palaeoctopus H. Woodward, 1896 †
• Calais Rafinesque, 1815
• Calcalia Krock. accepted as Adenostyles Cass.
• Calidia L.-E.Yang & J.Brodie, 2020
• Califia Hartman, 1957
• Calina Beneden, 1892 accepted as Gloiopotes Steenstrup & Lütken, 1861
• Callia J. E. Gray, 1840 accepted as Callianella R. B. Newton, 1891
• Callias Cass. (uncertain > unassessed)
• Calliax de Saint Laurent, 1973
• Callida A. J. Wagner, 1908 accepted as Calidviana H. B. Baker, 1954
• Callina Hannibal, 1912 accepted as Viviparus Montfort, 1810
• Callina R. T. Lowe, 1855
• Callisea Dana, 1852 accepted as Callianidea H. Milne Edwards, 1837
• Callisia L. accepted as Leysera L.
• Callista Poli, 1791
• Callonia Crosse & P. Fischer, 1870
• Calloria Cooper & Lee, 1993
• Calloria Fr., 1836
• Callpita M. Huber, 2010
• Calluna Salisb.
• Caloma Chamberlin, 1945
• Calopia Ponder, 1999
• Caloria Trinchese, 1888
• Caltha Mill. accepted as Calendula L.
• Caltha Tourn. ex Adans. (uncertain > unassessed)
• Calumia Smith, 1958
• Calvina Willems, 1972 †
• Calycia H. Adams, 1865
• Capellia Blake & Reid, 1998 †
• Carelia Cav. (uncertain > unassessed)
• Carelia Fabr. accepted as Ageratum L.
• Carelia H. Adams & A. Adams, 1855
• Carelia Juss. ex Cav. accepted as Mikania Willd.
• Carelia Less. accepted as Radlkoferotoma Kuntze
• Carelia moehring ; moehring ex Adans. accepted as Ageratum L.
• Carelia Möhring (uncertain > unassessed)
• Carolia Cantraine, 1838 †
• Carolia Gray, 1867 (uncertain > unassessed)
• Cavellia Iredale, 1915
• Cillia Kühn, 1954 †
• Clelia Fitzinger, 1826
• Coilia Gray, 1830
• Coolia Meunier, 1919
• Coullia Hamond, 1973
• Dallia Bean, 1880
• Dallia Jeffreys, 1883 accepted as Lepeta Gray, 1842
• Hallia Rochebrune, 1884 accepted as Hoylea Rochebrune, 1885 accepted as Eledone Leach, 1817