Helenium amarum (Raf.) H.Rock (original description)
Helenium drummondii H.Rock (original description)
Hymenopappus glandulopubescens Waterf. (original description)
Liatris cylindracea f. bartelii Steyerm. (original description)
Liatris squarrosa f. alba R.A.Evers & Thieret (original description)
Rudbeckia californica var. intermedia Perdue accepted as Rudbeckia klamathensis P.B.Cox & Urbatsch (original description)
Rudbeckia fulgida var. deamii (S.F.Blake) Perdue (original description)
Rudbeckia fulgida var. palustris (Eggert ex C.L.Boynton & Beadle) Perdue (original description)
Rudbeckia fulgida var. spathulata (Michx.) Perdue (original description)
Rudbeckia fulgida var. speciosa (Wender.) Perdue (original description)
Rudbeckia hirta var. angustifolia (T.V.Moore) Perdue (original description)
Rudbeckia hirta var. floridana (T.V.Moore) Perdue (original description)
Vernonia missurica f. swinkii Steyerm. (original description)