Boebera papposa (Vent.) Rydb. ex Rydb. accepted as Dyssodia papposa (Vent.) Hitchc. (original description)
Helianthus kellermanii Britton (original description)
Helianthus scrophulariifolius Britton accepted as Helianthus decapetalus L. (basis of record)
Helianthus x_ambiguus (Torr. & A.Gray) Britton (original description)
Picradeniopsis Rydb. ex Britton (original description)
Picradeniopsis oppositifolia (Nutt.) Rydb. ex Rydb. (original description)
Rudbeckia palustris Eggert (original description)
Senecio fremontii (Torr. & A.Gray) Rydb. accepted as Senecio riddellii Torr. & A.Gray (original description)
Tetraneuris stenophylla Rydb. accepted as Tetraneuris scaposa var. scaposa (DC.) Greene (original description)
Townsendia intermedia Rydb. ex Britton (original description)