Achillea arborea Hornem. accepted as Gonospermum canariense (DC.) Less. (original description)
Achyrophorus balbisii Hornem. accepted as Hypochaeris glabra L. (original description)
Anthemis hungarica Hornem. accepted as Cota austriaca (Jacq.) Sch.Bip. (original description)
Aster pubescens Hornem. accepted as Symphyotrichum cordifolium (L.) G.L.Nesom (original description)
Buphthalmum asperum Hornem. accepted as Wedelia hispida Kunth (original description)
Carlina biebersteinii Bernh. ex Hornem. (original description)
Centaurea pratensis Hornem. (original description)
Cnicus mitis Hornem. accepted as Cirsium mite Fisch. (original description)
Cnicus replicatus Hornem. accepted as Cirsium replicatum DC. (original description)
Crepis croatica Hornem. accepted as Crepis dioscoridis L. (original description)
Hedypnois caspica Hornem. (original description)
Hieracium crassifolium Bernh. ex Hornem. (original description)
Hieracium longifolium Hornem. (original description)
Lapsana pubescens Hornem. accepted as Lapsana communis L. (original description)
Picris davurica Fisch. ex Hornem. (original description)
Senecio micranthus Hornem. (original description)