Achillea aegyptiaca subsp. taygetea (Boiss. & Heldr.) Hayek accepted as Achillea taygetea Boiss. & Heldr. (original description)
Achillea tanacetifolia subsp. stricta (W.D.J.Koch) Hayek accepted as Achillea distans subsp. stricta Janch. (original description)
Anthemis orientalis subsp. cronia (Boiss. & Heldr.) Hayek accepted as Anthemis cretica subsp. tenuiloba (DC.) Grierson (original description)
Anthemis orientalis subsp. incana (Boiss.) Hayek accepted as Anthemis cretica subsp. spruneri (Boiss. & Heldr.) Govaerts (original description)
Anthemis orientalis subsp. montana Hayek accepted as Anthemis cretica L. (original description)
Anthemis orientalis subsp. sibthorpii (Griseb.) Hayek accepted as Anthemis cretica subsp. sibthorpii (Griseb.) Govaerts (original description)
Anthemis tomentosa subsp. peregrina (L.) Hayek accepted as Anthemis peregrina L. (original description)
Aster alpinus subsp. cylleneus (Boiss. & Orph.) Hayek (original description)
Calendula arvensis subsp. aegyptiaca (Pers.) Hayek accepted as Calendula arvensis (Vaill.) L. (original description)
Centaurea biokovensis subsp. mucuriensis Hayek accepted as Centaurea mucurensis Teyber (original description)
Centaurea deusta subsp. brunnea (Halácsy) Hayek accepted as Centaurea brunnea (Halácsy) Halácsy (original description)
Centaurea glaberrima subsp. divergens (Vis.) Hayek (original description)
Centaurea nervosa subsp. davidovii (Urum.) Hayek (original description)
Centaurea rupestris subsp. finazzeri Hayek accepted as Centaurea finazzeri Adamović (original description)
Crepis neglecta subsp. cretica (Boiss.) Hayek accepted as Crepis cretica Boiss. (original description)
Hieracium bifidum subsp. subcaesium (Fr.) Hayek accepted as Hieracium subcaesium (Fr.) Lindeb. (original description)
Hieracium murorum subsp. serratifrons (Zahn) Hayek accepted as Hieracium neoserratifrons T.Tyler (original description)
Hieracium sabaudum subsp. boreale (Fr.) Hayek (original description)
Hieracium sericophyllum var. acropoliosquamum Hayek accepted as Hieracium sericophyllum subsp. acropolioscapum Zahn (original description)
Hieracium trebevicianum subsp. subpleiophyllogenes Hayek accepted as Hieracium pseudobifidum subsp. subpleiophyllum (Zahn) Zahn (original description)
Inula candida subsp. aschersoniana (Janka) Hayek accepted as Inula aschersoniana Janka (original description)
Inula candida subsp. limoniifolia (Sm.) Hayek accepted as Inula candida (L.) Cass. (original description)
Inula candida subsp. methanaea (Hausskn.) Hayek accepted as Inula methanaea Hausskn. (original description)
Inula candida subsp. verbascifolia (Willd.) Hayek accepted as Inula verbascifolia (Willd.) Hausskn. (original description)
Inula salicina subsp. aspera (Poir.) Hayek accepted as Inula aspera Poir. (original description)
Inula thapsoides subsp. urumoffii (Degen) Hayek accepted as Inula urumoffii Degen (original description)
Leontodon crispus subsp. graecus (Boiss. & Heldr.) Hayek accepted as Leontodon graecus Boiss. & Heldr. (original description)
Leucanthemum ceratophylloides subsp. platylepis (Borbás) Hayek accepted as Leucanthemum platylepis Borbás (original description)
Leucanthemum graminifolium subsp. chloroticum (A.Kern. & Murb.) Hayek accepted as Leucanthemum chloroticum Kern. & Murb. ex Murb. (original description)
Phagnalon pumilum subsp. glabrum (Boiss.) Hayek accepted as Phagnalon pygmaeum (Sieber) Greuter (original description)
Phagnalon pumilum subsp. tomentosum (Halácsy) Hayek accepted as Phagnalon pygmaeum (Sieber) Greuter (original description)
Picris hieracioides subsp. auriculata (Sch.Bip.) Hayek accepted as Picris hieracioides subsp. villarsii (Jord.) Nyman (original description)
Senecio alpinus subsp. arnautorum (Velen.) Hayek accepted as Jacobaea arnautorum (Velen.) Pelser (original description)
Senecio alpinus subsp. subalpinus (W.D.J.Koch) Hayek accepted as Jacobaea subalpina (W.D.J.Koch) Pelser & Veldkamp (original description)
Senecio nebrodensis subsp. rupestris (Waldst. & Kit.) Hayek accepted as Senecio squalidus subsp. rupestris (Waldst. & Kit.) Greuter (original description)
Serratula radiata subsp. cetinjensis (Rohlena) Hayek accepted as Klasea radiata subsp. cetinjensis (Rohlena) Greuter & Wagenitz (original description)
Tanacetum larvatum (Pant.) Hayek (original description)
Taraxacum laevigatum subsp. calocephalum (Hand.-Mazz.) Hayek accepted as Taraxacum calocephalum Hand.-Mazz. (original description)
Taraxacum laevigatum subsp. glaucescens (M.Bieb.) Hayek (original description)
Taraxacum laevigatum subsp. pindicola (Bald.) Hayek accepted as Taraxacum pindicola (Bald.) Hand.-Mazz. (original description)
Xanthium saccharatum subsp. italicum (Moretti) Hayek accepted as Xanthium orientale subsp. italicum (Moretti) Greuter (original description)