Psacalium pippenianum L.O.Williams (original description)
Senecio cuchumatanensis L.O.Williams & Ant.Molina (original description)
Senecio epidendrus L.O.Williams accepted as Pentacalia epidendra (L.O.Williams) H.Rob. & Cuatrec. (original description)
Senecio greenmanii (H.Rob. & Brettell) L.O.Williams (original description)
Senecio montidorsensis L.O.Williams accepted as Telanthophora bartlettii H.Rob. & Brettell (original description)
Senecio nubivagus L.O.Williams (original description)
Senecio orogenes L.O.Williams accepted as Roldana schaffneri (Sch.Bip. ex Klatt) H.Rob. & Brettell (original description)
Senecio phorodendroides L.O.Williams (original description)
Senecio quezalticus L.O.Williams accepted as Trixis anomala B.L.Turner (original description)
Senecio sect. Psacaliopsides (H.Rob. & Brettell) L.O.Williams (original description)