Achillea croatica hort.vindob. ex Hornem. (original description)
Ageratum album Hort.Berol. ex Hornem. accepted as Ageratum conyzoides L. (original description)
Anthemis caucasica Hornem. accepted as Anthemis triumfetti (L.) All. (original description)
Apargia pratensis Hornem. accepted as Scorzoneroides autumnalis subsp. borealis (Ball) Greuter (original description)
Cnicus simplex Hornem. (original description)
Gnaphalium globosum Hornem. accepted as Euchiton involucratus (G.Forst.) Holub (original description)
Hieracium auriculatum Hornem. (original description)
Hieracium bienne (L.) Hornem. accepted as Crepis biennis L. (original description)
Hieracium coronopifolium Bernh. ex Hornem. accepted as Hieracium umbellatum L. (original description)
Hieracium flosculosum Hornem. (original description)
Hieracium pictum Schleich. ex Hornem. (original description)
Hieracium polyphyllum Bernh. ex Hornem. (original description)
Hieracium speciosum Hornem. (original description)
Hieracium tectorum Hornem. (original description)
Lactuca maculata Hornem. (original description)
Onobroma cretica (L.) Hornem. (original description)
Onobroma lanata (L.) Hornem. accepted as Carthamus lanatus L. (original description)
Onobroma mitissima (L.) Hornem. (original description)
Pulicaria inuloides Vahl ex Hornem. (original description)
Pyrethrum lacustre (Brot.) Hornem. (original description)
Serratula pulchella Fisch. ex Hornem. accepted as Jurinea pulchella (Fisch. ex Hornem.) DC. (original description)
Silphium asteriscus Hornem. (original description)
Virea asplenioides (L.) Vahl ex Hornem. accepted as Picris asplenioides L. (original description)
Wedelia minor Hort. ex Hornem. accepted as Melampodium divaricatum (Rich.) DC. (original description)