Acantholepis Less. accepted as Echinops L. (original description)
Acantholepis orientalis Less. accepted as Echinops acantholepis Jaub. & Spach (original description)
Adenocaulon chilense Less. (original description)
Adenolepis Less. accepted as Cosmos Cav. (original description)
Adenolepis pulchella Less. accepted as Bidens sandvicensis Less. (original description)
Amellus strigosus (Thunb.) Less. (original description)
Ampherephis indica Wall. ex Less. accepted as Phyllocephalum indicum (Less.) K.Kirkman (original description)
Ampherephis senegalensis Less. accepted as Herderia truncata Cass. (original description)
Andromachia deppeana Less. accepted as Sinclairia deppeana (Less.) Rydb. (original description)
Arnica chamissonis Less. (original description)
Arnica obtusifolia Less. accepted as Arnica unalaschcensis Less. (original description)
Arnica unalaschcensis Less. (original description)
Artemisia arctica Less. accepted as Artemisia norvegica subsp. saxatilis (Besser) H.M.Hall & Clem. (original description)
Artemisia australis Less. (original description)
Artemisia californica Less. (original description)
Artemisia canariensis (Besser) Less. accepted as Artemisia thuscula Cav. (original description)
Artemisia matricarioides Less. accepted as Matricaria matricarioides (Less.) Porter (original description)
Artemisia subg. Absinthium (Mill.) Less. (original description)
Artemisia subg. Matricarioides Less. (original description)
Artemisia subg. Tanacetoides Less. (original description)
Artemisia tanacetoides Less. (original description)
Aster californicus Less. accepted as Erigeron glaucus Ker Gawl. (original description)
Aster peregrinus Less. accepted as Symphyotrichum foliaceum (Lindl. ex DC.) G.L.Nesom (original description)
Aster radula Less. (original description)
Aster salsuginosus Less. accepted as Eurybia sibirica (L.) G.L.Nesom (original description)
Aster tenerrimus Less. accepted as Tetramolopium tenerrimum (Less.) Nees (original description)
Aster unalaschkensis Less. accepted as Erigeron peregrinus (Banks ex Pursh) Greene (original description)
Baccharis lingulata Kunze (original description)
Bidens sandvicensis Less. (original description)
Campylotheca australis Less. accepted as Bidens micrantha Gaudich. (original description)
Carpesium nepalense Less. (original description)
Carpesium trachelifolium Less. (original description)
Centaurea indica Less. (original description)
Centaurea viminea Less. accepted as Centaurea pulchella Ledeb. (original description)
Centaurea wallichiana Less. (original description)
Cephalophora anthemoides Less. accepted as Hymenoxys anthemoides (Juss.) Cass. ex DC. (original description)
Cephalophora decurrens Less. accepted as Helenium puberulum DC. (original description)
Cephalophora radiata Less. accepted as Helenium radiatum (Less.) Seckt (original description)
Chiliotrichum rosmarinifolium Less. accepted as Chiliotrichum diffusum (G.Forst.) Kuntze (original description)
Coinogyne Less. accepted as Jaumea Pers. (original description)
Coinogyne carnosa Less. accepted as Jaumea carnosa (Less.) A.Gray (original description)
Conyza arguta Less. accepted as Baccharis breviseta DC. (original description)
Conyza ivifolia (L.) Less. accepted as Erigeron ivifolius (L.) Sch.Bip. (original description)
Conyza manillensis Less. accepted as Blumea manillensis (Less.) DC. (original description)
Conyza triplinervia Less. accepted as Baccharis vulneraria Baker (original description)
Cotula rosea Boj. ex Less. (original description)
Crossostephium Less. (original description)
Crossostephium artemisioides Less. (original description)
Cyrtolepis Less. accepted as Anacyclus L. (original description)
Cyrtolepis monantha (L.) Less. accepted as Flaveria bidentis (L.) Kuntze (original description)
Diplopappus chamissonis Less. accepted as Haplopappus integerrimus (Hook. & Arn.) H.M.Hall (original description)
Diplopappus chrysanthemifolius Less. accepted as Haplopappus chrysanthemifolius (Less.) DC. (original description)
Diplopappus coronopifolius Less. accepted as Haplopappus glutinosus Cass. (original description)
Diplopappus diffusus (Pers.) Less. accepted as Noticastrum diffusum (Pers.) Cabrera (original description)
Diplopappus ericoides Less. accepted as Ericameria ericoides (Less.) Nutt. ex Jeps. (original description)
Diplopappus fruticulosus (Willd.) Less. accepted as Felicia fruticosa subsp. fruticosa (L.) G.Nicholson (original description)
Diplopappus glutinosus Poepp. ex Less. accepted as Haplopappus glutinosus Cass. (original description)
Diplopappus grindelioides Less. accepted as Haplopappus grindelioides (Less.) DC. (original description)
Diplopappus macrocephalus Poepp. ex Less. accepted as Haplopappus macrocephalus (Poepp. ex Less.) DC. (original description)
Diplopappus obtusatus Less. accepted as Chrysocoma obtusata (Thunb.) Ehr.Bayer (original description)
Diplopappus prunelloides Poepp. ex Less. accepted as Haplopappus prunelloides (Poepp. ex Less.) Poepp. ex DC. (original description)
Diplopappus rotundifolius Less. accepted as Olearia tomentosa (Wendl.) DC. (original description)
Diplopappus sericeus Less. accepted as Noticastrum sericeum (Less.) Less. ex Phil. (original description)
Diplopappus teretifolia Less. (original description)
Distreptus spiralis Less. accepted as Pseudelephantopus spiralis (Less.) Cronquist (original description)
Elephantopus micropappus Less. (original description)
Elphegea cilata Less. accepted as Zyrphelis taxifolia (L.) Nees (original description)
Enydra maritima (Kunth) Less. accepted as Enydra sessilifolia (Ruiz & Pav.) Cabrera (original description)
Epaltes littoralis (Retz.) Less. accepted as Epaltes australis Less. (original description)
Eremanthus incanus (Less.) Less. (original description)
Erigeron alpinus Less. accepted as Erigeron pulchellus Michx. (original description)
Erigeron lepidotus Less. (original description)
Eupatorium araliifolium Less. accepted as Neomirandea araliifolia (Less.) R.M.King & H.Rob. (original description)
Eupatorium ciliatum Less. accepted as Ageratina ciliata (Less.) R.M.King & H.Rob. (original description)
Eupatorium glechonophyllum Less. accepted as Ageratina glechonophylla (Less.) R.M.King & H.Rob. (original description)
Eupatorium leiophyllum Less. accepted as Ageratina havanensis (Kunth) R.M.King & H.Rob. (original description)
Eupatorium papantlense Less. accepted as Ageratina havanensis (Kunth) R.M.King & H.Rob. (original description)
Eupatorium pycnocephalum Less. accepted as Fleischmannia pycnocephala (Less.) R.M.King & H.Rob. (original description)
Eupatorium sordidum Less. accepted as Bartlettina sordida (Less.) R.M.King & H.Rob. (original description)
Franseria chamissonis Less. accepted as Ambrosia chamissonis (Less.) Greene (original description)
Franseria chamissonis var. bipinnatisecta Less. accepted as Ambrosia chamissonis (Less.) Greene (original description)
Franseria chamissonis var. malvifolia Less. (original description)
Gaillardiinae Less. (original description)
Gnaphalium circinnatum Hils. & Bojer ex Less. accepted as Helichrysum mutisiifolium Less. (original description)
Gnaphalium falcatum var. braziliense Cham. & Schltdl. accepted as Gamochaeta stagnalis (I.M.Johnst.) Anderb. (original description)
Gnaphalium falcatum var. chiliense Cham. & Schltdl. accepted as Gamochaeta stagnalis (I.M.Johnst.) Anderb. (original description)
Gnaphalium piravira Less. accepted as Gnaphalium viravira Molina (original description)
Gnaphalium rufum Willd. ex Less. accepted as Achyrocline satureioides (Lam.) DC. (original description)
Haplocarpha Less. (original description)
Haplocarpha lanata (Thunb.) Less. (original description)
Helichrysum divergens Less. (original description)
Helichrysum mutisiaefolium Less. (original description)
Helichrysum mutisiifolium Less. (original description)
Hertia crassifolia Less. (original description)
Heterothalamus brunioides Less. accepted as Baccharis aliena (Spreng.) Joch.Müll. (original description)
Heterothalamus psiadioides Less. accepted as Baccharis psiadioides (Less.) Joch.Müll. (original description)
Hieracium chilense Less. (original description)
Hippia gracilis Less. accepted as Hippia pilosa (P.J.Bergius) Druce (original description)
Isocarpha bilbergiana Less. (original description)
Isocarpha billbergiana Less. accepted as Isocarpha atriplicifolia (L.) R.Br. ex DC. (original description)