Agoseris obtusifolia (Suksd.) Rydb. accepted as Agoseris grandiflora (Nutt.) Greene (original description)
Agoseris tenuifolia (A.Gray) Rydb. accepted as Agoseris elata (Nutt.) Greene (original description)
Agoseris turbinata Rydb. accepted as Agoseris glauca (Pursh) Raf. (original description)
Crepis seselifolia Rydb. accepted as Crepis acuminata Nutt. (original description)
Heteropleura fendleri (Sch.Bip.) Rydb. accepted as Hieracium fendleri Sch.Bip. (original description)
Heteropleura pendleri Rydb. (original description)
Lactuca polyphylla Rydb. (original description)
Ptilocalais macrolepis Rydb. accepted as Microseris nutans (Hook.) Sch.Bip. (original description)