Lasiorrhiza ceterachifolia Cass. accepted as Leucheria suaveolens (d'Urv.) Speg. (original description)
Lasiorrhiza viscosa Cass. accepted as Leucheria suaveolens (d'Urv.) Speg. (original description)
Ogiera leiocarpa Cass. accepted as Eleutheranthera ruderalis (Sw.) Sch.Bip. (original description)
Porcellites cretensis Cass. (original description)
Porcellites helveticus Cass. (original description)
Porcellites maculata Cass. (original description)
Porcellites radicata (L.) Cass. accepted as Hypochaeris radicata L. (original description)
Porophyllum ellipticum (L.) Cass. accepted as Eucephalus glabratus (Greene) Greene (original description)
Porophyllum jorullense (Kunth) Cass. accepted as Porophyllum punctatum (Mill.) S.F.Blake (original description)
Porophyllum ruderale (Jacq.) Cass. (original description)
Porophyllum suffruticosum (L.) Cass. accepted as Porophyllum linifolium (L.) DC. (original description)
Praxelis Cass. (original description)
Praxelis villosa Cass. accepted as Praxelis diffusa (Rich.) Pruski (original description)
Printzia bergii Cass. accepted as Printzia polifolia (L.) Hutch. (original description)
Pronacron Cass. accepted as Melampodium L. (original description)
Pronacron ramosissima Cass. (original description)
Psacalium Cass. (original description)
Psacalium peltatum (Kunth) Cass. (original description)
Psephellus Cass. (original description)
Psephellus calocephalus Cass. (original description)
Sonchus leptocephalus Cass. (original description)