Centaurea choulettei Gand. (original description)
Centaurea corsica Gand. accepted as Centaurea sphaerocephala L. (original description)
Centaurea littorea Gand. (original description)
Cirsium bactiacense Gand. (original description)
Cirsium haberianum Gand. (original description)
Cirsium longirameum Gand. (original description)
Crepis amphisboena Gand. accepted as Crepis conyzifolia (Gouan) A.Kern. (original description)
Crepis autaretica Gand. accepted as Crepis pygmaea L. (original description)
Crepis cichoroides Gand. (original description)
Crepis deloynei Gand. accepted as Crepis pulchra subsp. pulchra L. (original description)
Crepis oxyphylla Gand. accepted as Crepis pulchra subsp. pulchra L. (original description)
Crepis perrieri Gand. accepted as Crepis conyzifolia (Gouan) A.Kern. (original description)
Crepis royi Gand. accepted as Crepis pygmaea L. (original description)
Crepis subglabrescens Gand. accepted as Crepis pygmaea L. (original description)
Crepis trichosticta Gand. (original description)
Crepis vendeana Gand. accepted as Crepis pulchra subsp. pulchra L. (original description)
Crupina etrusca Gand. (original description)
Crupina insularis Gand. (original description)
Crupina villosa Gand. (original description)
Hieracium harpago Gand. (original description)
Hieracium tephrochlamys Gand. (original description)