Ambrosia striata Rydb. (original description)
Ambrosia variabilis Rydb. (original description)
Aster batesii Rydb. (original description)
Aster finkii Rydb. accepted as Symphyotrichum ×finkii (Rydb.) G.L.Nesom (original description)
Aster laeviformis Rydb. (original description)
Aster lucidulus (A.Gray) Rydb. accepted as Symphyotrichum firmum (Nees) G.L.Nesom (original description)
Aster oticus Rydb. (original description)
Aster woldeni Rydb. (original description)
Aster woldenii Rydb. (original description)
Bidens filamentosa Rydb. accepted as Bidens cernua L. (original description)
Bidens sandbergii Rydb. accepted as Bidens connata Muhl. ex Willd. (original description)
Brickellia umbellata (Greene) Rydb. accepted as Brickellia grandiflora (Hook.) Nutt. (original description)
Chrysopsis ballardii Rydb. accepted as Heterotheca villosa var. ballardii (Rydb.) Semple (original description)
Espeletia alba A.C.Sm. accepted as Espeletia spicata Sch.Bip. ex Wedd. (original description)
Espeletia atropurpurea A.C.Sm. (original description)
Espeletia canescens A.C.Sm. (original description)
Espeletia conglomerata A.C.Sm. (original description)
Espeletia occidentalis A.C.Sm. (original description)
Espeletia phaneractis (S.F.Blake) A.C.Sm. (original description)
Espeletia santanderensis A.C.Sm. (original description)
Espeletia standleyana A.C.Sm. (original description)
Espeletia thyrsiformis A.C.Sm. (original description)
Eupatorium holzingeri Rydb. accepted as Eupatorium purpureum L. (original description)
Euthamia glutinosa Rydb. accepted as Euthamia gymnospermoides Greene (original description)
Isopappus validus Rydb. accepted as Croptilon hookerianum var. validum (Rydb.) E.B.Sm. (original description)
Lacinaria herrickii Rydb. accepted as Liatris ligulistylis (A.Nelson) K.Schum. (original description)
Liatris bebbiana Rydb. accepted as Liatris pycnostachya var. pycnostachya Michx. (original description)
Liatris compacta (Torr. & A.Gray) Rydb. accepted as Liatris squarrosa (L.) Willd. (original description)
Liatris glabrata Rydb. accepted as Liatris squarrosa (L.) Willd. (original description)
Liatris haywardii Rydb. accepted as Liatris ligulistylis (A.Nelson) K.Schum. (original description)
Liatris herrickii (Steele) Rydb. accepted as Liatris ligulistylis (A.Nelson) K.Schum. (original description)
Liatris ligulistylis (A.Nelson) Rydb. accepted as Liatris ligulistylis (A.Nelson) K.Schum. (original description)
Liatris rosendahlii Rydb. accepted as Liatris ligulistylis (A.Nelson) K.Schum. (original description)
Solidago hapemaniana Rydb. accepted as Solidago missouriensis Nutt. (original description)
Solidago lunellii Rydb. accepted as Solidago canadensis L. (original description)
Solidago somesii Rydb. accepted as Solidago gigantea Aiton (original description)