Mesadenia angustifolia Rydb. accepted as Arnoglossum ovatum (Walter) H.Rob. (original description)
Pericalia michoacana (B.L.Rob.) Rydb. accepted as Senecio michoacanus (B.L.Rob.) B.L.Turner & T.M.Barkley (original description)
Pericalia ovatifolia (Sch.Bip.) Rydb. accepted as Senecio sessilifolius (Hook. & Arn.) Hemsl. (original description)
Pericalia sessilifolia (Hook. & Arn.) Rydb. accepted as Senecio sessilifolius (Hook. & Arn.) Hemsl. (original description)
Pericalia suffulta (Greenm.) Rydb. accepted as Senecio suffultus (Greenm.) McVaugh (original description)
Psacalium argutum Rydb. (original description)
Psacalium conzattii (B.L.Rob. & Greenm.) Rydb. (original description)
Psacalium coulteri Rydb. (original description)
Psacalium holwayanum (B.L.Rob.) Rydb. (original description)
Psacalium langlassei Rydb. (original description)
Psacalium megaphyllum (B.L.Rob. & Greenm.) Rydb. (original description)
Psacalium nelsonii Rydb. (original description)
Psacalium obtusilobum (B.L.Rob. & Greenm.) Rydb. (original description)
Psacalium peltigerum (B.L.Rob. & Seaton) Rydb. (original description)
Psacalium poculiferum (S.Watson) Rydb. (original description)
Psacalium tabulare Rydb. (original description)