Diacantha ambigua Cass. accepted as Barnadesia dombeyana Less. (original description)
Diglossus Cass. accepted as Tagetes L. (original description)
Diglossus variabilis Cass. accepted as Tagetes filifolia Lag. (original description)
Dimorphanthes bidentata Cass. accepted as Psiadia callocephala Cordem. (original description)
Diomedea bidentata Cass. accepted as Borrichia frutescens (L.) DC. (original description)
Diomedea indentata Cass. accepted as Borrichia arborescens (L.) DC. (original description)
Diomedea linearis Cass. accepted as Borrichia frutescens (L.) DC. (original description)
Diplopappus delphinifolius Cass. accepted as Erigeron neomexicanus A.Gray (original description)
Diplopappus intermedius Cass. accepted as Chrysopsis gossypina (Michx.) Elliott (original description)
Diplopappus lanatus Cass. accepted as Chrysopsis gossypina subsp. gossypina (Michx.) Elliot (original description)
Diplopappus villosus Cass. accepted as Symphyotrichum pilosum var. pilosum (Willd.) G.L.Nesom (original description)
Distreptus angustifolius (Sw.) Cass. accepted as Orthopappus angustifolius (Sw.) Gleason (original description)
Distreptus nudiflorus Cass. accepted as Pseudelephantopus spicatus (B.Juss. ex Aubl.) C.F.Baker (original description)
Distreptus spicatus (B.Juss. ex Aubl.) Cass. accepted as Pseudelephantopus spicatus (B.Juss. ex Aubl.) C.F.Baker (original description)
Duchesnia crispa (Forssk.) Cass. accepted as Pulicaria undulata subsp. undulata (L.) C.A.Mey. (original description)