Aster salsuginosus var. angustifolius A.Gray (original description)
Bahia sect. Pseudomonolopia A.Gray (original description)
Crepis occidentalis var. crinita A.Gray accepted as Crepis monticola Coville (original description)
Erigeron foliosus var. stenophyllus (Nutt.) A.Gray accepted as Erigeron foliosus var. foliosus Nutt. (original description)
Haplopappus paniculatus var. stenocephalus A.Gray (original description)
Hieracium triste var. detonsum A.Gray (original description)
Hieracium triste var. gracile (Hook.) A.Gray accepted as Hieracium triste Willd. ex Spreng. (original description)
Micropus californicus var. subvestitus A.Gray (original description)
Monolopia bahiifolia var. pinnatifida A.Gray (original description)
Monolopia major var. lanceolata (Nutt.) A.Gray (original description)
Monolopia sect. Pseudobahia A.Gray accepted as Pseudobahia (A.Gray) Rydb. (original description)
Senecio aureus var. multilobatus (Torr. & A.Gray) A.Gray accepted as Packera multilobata (Torr. & A.Gray ex A.Gray) W.A.Weber & Á.Löve (original description)
Senecio lugens var. foliosus A.Gray (original description)
Tetradymia canescens var. inermis (Nutt.) A.Gray (original description)
Tetradymia squamata var. palmeri A.Gray (original description)
Troximon glaucum var. taraxacifolium (Nutt.) A.Gray accepted as Agoseris parviflora (Nutt.) D.Dietr. (original description)