Krigia virginica (L.) A.Nelson accepted as Krigia biflora (Walter) S.F.Blake (original description)
Macronema grindelioides Rydb. (original description)
Macronema lineare var. canescens A.Nelson (original description)
Oonopsis condensata (A.Nelson) A.Nelson accepted as Oonopsis wardii (A.Gray) Greene (original description)
Senecio canus var. purshianus (Nutt.) A.Nelson accepted as Packera cana (Hook.) W.A.Weber & Á.Löve (original description)
Senecio perplexus var. dispar A.Nelson (original description)
Townsendia exscapa var. wilcoxiana A.Nelson (original description)
Troximon glaucum var. pumilum A.Nelson (original description)
Xylorhiza glabriuscula var. villosa (Nutt.) A.Nelson accepted as Xylorhiza glabriuscula Nutt. (original description)