Hymenoxys canescens (D.C.Eaton) Cockerell accepted as Hymenoxys cooperi (A.Gray) Cockerell (original description)
Hymenoxys canescens subsp. biennis (A.Gray) Cockerell accepted as Hymenoxys biennis (A.Gray) H.M.Hall (original description)
Hymenoxys canescens var. nevadensis Cockerell (original description)
Hymenoxys chrysanthemoides var. excurrens Cockerell (original description)
Hymenoxys chrysanthemoides var. juxta Cockerell (original description)
Hymenoxys chrysanthemoides var. multiflora (Buckley) Cockerell (original description)
Hymenoxys chrysanthemoides var. osterhoutii Cockerell (original description)
Hymenoxys cooperi subsp. grayi Cockerell (original description)
Hymenoxys davidsonii (Greene) Cockerell (original description)
Hymenoxys floribunda var. intermedia Cockerell (original description)
Hymenoxys floribunda var. utilis (Cockerell) Cockerell (original description)
Hymenoxys richardsonii subsp. liguliflora (A.Nelson) Cockerell (original description)
Hymenoxys richardsonii subsp. macrantha (A.Nelson) Cockerell (original description)
Hymenoxys richardsonii subsp. pumila (Greene) Cockerell (original description)
Hymenoxys richardsonii var. macounii Cockerell (original description)
Hymenoxys richardsonii var. utahensis Cockerell (original description)