Haplopappus aberrans (A.Nelson) H.M.Hall accepted as Tonestus aberrans (A.Nelson) G.L.Nesom & D.R.Morgan (original description)
Haplopappus acaulis subsp. glabratus (D.C.Eaton) H.M.Hall accepted as Stenotus acaulis (Nutt.) Nutt. (original description)
Haplopappus acaulis subsp. typicus H.M.Hall accepted as Stenotus acaulis (Nutt.) Nutt. (original description)
Haplopappus acradenius subsp. bracteosus (Greene) H.M.Hall accepted as Isocoma acradenia var. bracteosa (Greene) G.L.Nesom (original description)
Haplopappus acradenius subsp. eremophilus (Greene) H.M.Hall accepted as Isocoma acradenia var. eremophila (Greene) G.L.Nesom (original description)
Haplopappus acradenius subsp. typicus H.M.Hall (original description)
Haplopappus bloomeri subsp. angustatus (A.Gray) H.M.Hall (original description)
Haplopappus bloomeri subsp. compactus H.M.Hall accepted as Ericameria compacta (H.M.Hall) G.L.Nesom (original description)
Haplopappus bloomeri subsp. sonnei H.M.Hall (original description)
Haplopappus bloomeri subsp. typicus H.M.Hall (original description)
Haplopappus carthamoides subsp. cusickii (A.Gray) H.M.Hall accepted as Pyrrocoma carthamoides var. cusickii (A.Gray) Kartesz & Gandhi (original description)
Haplopappus carthamoides subsp. erythropappus (Rydb.) H.M.Hall accepted as Pyrrocoma carthamoides var. carthamoides Hook. (original description)
Haplopappus carthamoides subsp. maximus (A.Gray) H.M.Hall (original description)
Haplopappus carthamoides subsp. rigidus (Rydb.) H.M.Hall accepted as Pyrrocoma carthamoides var. carthamoides Hook. (original description)
Haplopappus carthamoides subsp. subsquarrosus (Greene) H.M.Hall accepted as Pyrrocoma carthamoides var. subsquarrosa (Greene) G.K.Br. & D.J.Keil (original description)
Haplopappus carthamoides subsp. typicus H.M.Hall (original description)
Haplopappus contractus H.M.Hall accepted as Pyrrocoma uniflora var. uniflora (Hook.) Greene (original description)
Haplopappus cooperi (A.Gray) H.M.Hall accepted as Ericameria cooperi (A.Gray) H.M.Hall (original description)
Haplopappus croceus subsp. genuflexus H.M.Hall (original description)
Haplopappus croceus subsp. typicus H.M.Hall (original description)
Haplopappus eastwoodiae H.M.Hall accepted as Ericameria fasciculata (Eastw.) J.F.Macbr. (original description)
Haplopappus fremontii subsp. monocephalus H.M.Hall (original description)
Haplopappus fremontii subsp. typicus H.M.Hall (original description)
Haplopappus greenei subsp. mollis (A.Gray) H.M.Hall accepted as Ericameria greenei (A.Gray) G.L.Nesom (original description)
Haplopappus greenei subsp. typicus H.M.Hall (original description)
Haplopappus hirtus subsp. lanulosus (Greene) H.M.Hall accepted as Pyrrocoma hirta var. lanulosa (Greene) Mayes ex G.K.Br. & D.J.Keil (original description)
Haplopappus hirtus subsp. sonchifolius (Greene) H.M.Hall accepted as Pyrrocoma hirta var. sonchifolia (Greene) Kartesz & Gandhi (original description)
Haplopappus hirtus subsp. typicus H.M.Hall accepted as Pyrrocoma hirta var. hirta (A.Gray) Greene (original description)
Haplopappus integerrimus (Hook. & Arn.) H.M.Hall (original description)
Haplopappus integrifolius subsp. insecticruris (L.F.Hend.) H.M.Hall accepted as Pyrrocoma insecticruris (L.F.Hend.) A.Heller (original description)
Haplopappus integrifolius subsp. liatriformis (Greene) H.M.Hall accepted as Pyrrocoma liatriformis Greene (original description)
Haplopappus lanceolatus subsp. vaseyi (Parry ex D.C.Eaton) H.M.Hall accepted as Pyrrocoma lanceolata var. lanceolata (Hook.) Greene (original description)
Haplopappus lanuginosus subsp. andersonii (Rydb.) H.M.Hall (original description)
Haplopappus lanuginosus subsp. typicus H.M.Hall (original description)
Haplopappus linearifolius subsp. interior (Coville) H.M.Hall accepted as Ericameria linearifolia (DC.) Urbatsch & Wussow (original description)
Haplopappus linearifolius subsp. typicus H.M.Hall (original description)
Haplopappus macronema subsp. linearis (Rydb.) H.M.Hall (original description)
Haplopappus macronema subsp. typicus H.M.Hall (original description)
Haplopappus occidentalis H.M.Hall accepted as Benitoa occidentalis (H.M.Hall) D.D.Keck (original description)
Haplopappus palmeri subsp. pachylepis H.M.Hall accepted as Ericameria palmeri var. pachylepis (H.M.Hall) G.L.Nesom (original description)
Haplopappus palmeri subsp. typicus H.M.Hall (original description)
Haplopappus philippii (Kuntze) H.M.Hall (original description)
Haplopappus phyllocephalus subsp. primitivus H.M.Hall (original description)
Haplopappus pluriflorus (Torr. & A.Gray) H.M.Hall accepted as Isocoma pluriflora (Torr. & A.Gray) Greene (original description)
Haplopappus pristiphyllus (J.Rémy) H.M.Hall (original description)
Haplopappus punctatus H.M.Hall (original description)
Haplopappus racemosus subsp. brachycephalus (A.Nelson) H.M.Hall accepted as Pyrrocoma racemosa var. paniculata (Nutt.) Kartesz & Gandhi (original description)
Haplopappus racemosus subsp. congestus (Greene) H.M.Hall accepted as Pyrrocoma racemosa var. congesta (Greene) Mayes ex G.K.Br. & D.J.Keil (original description)
Haplopappus racemosus subsp. duriusculus (Greene) H.M.Hall accepted as Pyrrocoma racemosa var. paniculata (Nutt.) Kartesz & Gandhi (original description)
Haplopappus racemosus subsp. glomeratus (Nutt.) H.M.Hall accepted as Pyrrocoma racemosa var. paniculata (Nutt.) Kartesz & Gandhi (original description)
Haplopappus racemosus subsp. halophilus (Greene) H.M.Hall accepted as Pyrrocoma racemosa var. paniculata (Nutt.) Kartesz & Gandhi (original description)
Haplopappus racemosus subsp. longifolius (Greene) H.M.Hall (original description)
Haplopappus racemosus subsp. prionophyllus (Greene) H.M.Hall accepted as Pyrrocoma racemosa var. paniculata (Nutt.) Kartesz & Gandhi (original description)
Haplopappus racemosus subsp. sessiliflorus (Greene) H.M.Hall accepted as Pyrrocoma racemosa var. sessiliflora (Greene) Mayes ex G.K.Br. & D.J.Keil (original description)
Haplopappus racemosus subsp. typicus H.M.Hall (original description)
Haplopappus reicheanus H.M.Hall (original description)
Haplopappus rosulatus H.M.Hall (original description)
Haplopappus rotundifolius H.M.Hall (original description)
Haplopappus spinulosus subsp. australis (Greene) H.M.Hall (original description)
Haplopappus spinulosus subsp. gooddingii H.M.Hall (original description)
Haplopappus spinulosus subsp. laevis (Wooton & Standl.) H.M.Hall (original description)
Haplopappus spinulosus subsp. scabrellus (Greene) H.M.Hall (original description)
Haplopappus squarrosus subsp. obtusus (Greene) H.M.Hall accepted as Hazardia squarrosa var. obtusa (Greene) Jeps. (original description)
Haplopappus squarrosus subsp. stenolepis H.M.Hall accepted as Hazardia stenolepis Hoover (original description)
Haplopappus squarrosus subsp. typicus H.M.Hall (original description)
Haplopappus stenolobus (Greene) H.M.Hall accepted as Machaeranthera stenoloba (Greene) Shinners (original description)
Haplopappus suffruticosus subsp. tenuis H.M.Hall (original description)
Haplopappus suffruticosus subsp. typicus H.M.Hall (original description)
Haplopappus uniflorus subsp. gossypinus (Greene) H.M.Hall accepted as Pyrrocoma uniflora var. gossypina (Greene) Kartesz & Gandhi (original description)
Haplopappus uniflorus subsp. howellii (A.Gray) H.M.Hall accepted as Pyrrocoma uniflora var. uniflora (Hook.) Greene (original description)
Haplopappus uniflorus subsp. typicus H.M.Hall accepted as Pyrrocoma uniflora var. uniflora (Hook.) Greene (original description)
Haplopappus venetus subsp. furfuraceus (Greene) H.M.Hall accepted as Isocoma menziesii var. decumbens (Greene) G.L.Nesom (original description)
Haplopappus venetus subsp. oxyphyllus (Greene) H.M.Hall accepted as Isocoma menziesii var. menziesii (Hook. & Arn.) G.L.Nesom (original description)
Haplopappus venetus subsp. tridentatus (Greene) H.M.Hall accepted as Isocoma menziesii var. tridentata (Greene) G.L.Nesom (original description)
Haplopappus venetus subsp. typicus H.M.Hall (original description)
Haplopappus venetus subsp. vernonioides (Nutt.) H.M.Hall accepted as Isocoma menziesii var. vernonioides (Nutt.) G.L.Nesom (original description)