Achaetogeron galeottii A.Gray ex Hemsl. accepted as Erigeron galeottii (A.Gray) Greene (original description)
Achaetogeron seemannii A.Gray ex Hemsl. accepted as Erigeron seemannii Greene (original description)
Actinomeris stricta Hemsl. accepted as Verbesina stricta (Hemsl.) A.Gray (original description)
Adenophyllum porophyllum (Cav.) Hemsl. (original description)
Ageratum albidum (DC.) Hemsl. (original description)
Ageratum echioides (Less.) Hemsl. (original description)
Ageratum glanduliferum Sch.Bip. ex Hemsl. (original description)
Ageratum isocarphoides (DC.) Hemsl. (original description)
Ageratum latifolium (Benth.) Hemsl. accepted as Ageratum nelsonii (B.L.Rob.) M.F.Johnson (original description)
Ageratum microcarpum (Benth. ex Benth.) Hemsl. accepted as Ageratum conyzoides L. (original description)
Ageratum microcephalum (Benth.) Hemsl. (original description)
Ageratum paleaceum (Gay ex DC.) Hemsl. accepted as Ageratum paleaceum (DC.) Hemsley (original description)
Ageratum petiolatum (Hook. & Arn.) Hemsl. (original description)
Ageratum salicifolium Hemsl. accepted as Ageratum corymbosum Zucc. ex Pers. (original description)
Ageratum scabriusculum Hemsl. accepted as Ageratum petiolatum (Hook. & Arn.) Hemsl. (original description)
Ageratum strictum Hemsl. accepted as Ageratum corymbosum Zucc. ex Pers. (original description)
Ageratum tomentosum (Benth. ex Benth.) Hemsl. accepted as Ageratum tomentosum (Benth. ex Oersted) Hemsley (original description)
Alomia alata Hemsl. (original description)
Aspilia strigosa (Hook. & Arn.) Benth. (original description)
Aster carnosus (A.Gray) A.Gray ex Hemsl. accepted as Machaeranthera carnosa (A.Gray) G.L.Nesom (original description)
Baccharis hieraciifolia Hemsl. accepted as Archibaccharis hieracioides (S.F.Blake) S.F.Blake (original description)
Baccharis orizabaensis Sch.Bip. ex Hempel accepted as Baccharis conferta Kunth (original description)
Bellis xanthocomoides (Less.) A.Gray ex Hemsl. accepted as Astranthium xanthocomoides (Less.) Larsen (original description)
Bidens ferulifolia Hemsl. (original description)
Bigelowia hartwegii A.Gray ex Hemsl. (original description)
Boltonia campestris (A.Gray) Hemsl. accepted as Dichaetophora campestris A.Gray (original description)
Brickellia rosalesia (DC.) Benth. & Hook.f. ex Hemsl. accepted as Brickellia cavanillesii (Cass.) A.Gray (original description)
Cacalia parasitica Sch.Bip. ex Hemsl. (original description)
Cacalia racemosa Sch.Bip. ex Hemsl. accepted as Senecio helodes Benth. (original description)
Calea integrifolia (DC.) Hemsl. accepted as Alloispermum integrifolium (DC.) H.Rob. (original description)
Calea manicata (Schltdl.) Benth. & Hook.f. ex Hemsl. accepted as Tetrachyron manicatum Schltdl. (original description)
Calea rugosa (DC.) Hemsl. accepted as Calea ternifolia Kunth (original description)
Calea sabazioides (Less.) Hemsl. accepted as Sabazia sarmentosa var. sarmentosa (original description)
Calea salmaefolia (DC.) Hemsl. accepted as Calea ternifolia Kunth (original description)
Chaptalia ehrenbergii (Sch.Bip.) Hemsl. accepted as Leibnitzia lyrata (Sch.Bip.) G.L.Nesom (original description)
Chaptalia nutans (L.) Hemsl. accepted as Chaptalia nutans (L.) Polák (original description)
Chaptalia seemannii (Sch.Bip.) Hemsl. accepted as Leibnitzia lyrata (Sch.Bip.) G.L.Nesom (original description)
Chaptalia spathulata (D.Don) Hemsl. (original description)
Chionolaena lavandulacea (DC.) Benth. & Hook. ex Hemsl. accepted as Gnaphaliothamnus lavandulifolius (Kunth) G.L.Nesom (original description)
Cnicus acantholepis Hemsl. accepted as Cirsium acantholepis (Hemsl.) Petr. (original description)
Cnicus conspicuus (G.Don) Hemsl. accepted as Cirsium conspicuum (G.Don) Sch.Bip. (original description)
Cnicus lappoides (Less.) Hemsl. accepted as Cirsium lappoides (Less.) Sch.Bip. (original description)
Cnicus lomatolepis Hemsl. accepted as Cirsium lomatolepis (Hemsl.) Petr. (original description)
Cnicus mexicanus (DC.) Hemsl. accepted as Cirsium mexicanum DC. (original description)
Cnicus radians (Benth.) Hemsl. accepted as Cirsium radians Benth. (original description)
Cnicus rhaphilepis Hemsl. accepted as Cirsium rhaphilepis (Hemsl.) Petr. (original description)
Cnicus subcoriaceus (Less.) Hemsl. accepted as Cirsium subcoriaceum (Less.) Sch.Bip. ex Sch.Bip. (original description)
Coreopsis galeottii (A.Gray) Hemsl. accepted as Coreopsis mutica var. subvillosa DC. (original description)
Coreopsis liebmannii Sch.Bip. ex Hemsl. accepted as Verbesina intermissa S.F.Blake (original description)
Coreopsis mexicana (DC.) Hemsl. accepted as Coreopsis mutica var. mutica DC. (original description)
Coreopsis rudis (Benth.) Benth. & Hook.f. ex Hemsl. (original description)
Cosmos linearifolius (Sch.Bip.) Hemsl. (original description)
Cosmos purpureus (DC.) Benth. & Hook.f. ex Hemsl. (original description)
Cotula pygmaea (Kunth) Benth. & Hook.f. ex Hemsl. accepted as Cotula mexicana (DC.) Cabrera (original description)
Desmanthodium guatemalense Hemsl. (original description)
Distasis heterophylla Hemsl. (original description)
Egletes liebmannii (original description)
Encelia amplexicaulis (Cav.) Hemsl. accepted as Simsia amplexicaulis (Cav.) Pers. (original description)
Encelia cordata (Kunth) Hemsl. accepted as Simsia amplexicaulis (Cav.) Pers. (original description)
Encelia exaristata (A.Gray) A.Gray ex Hemsl. accepted as Simsia lagascaeformis DC. (original description)
Encelia foetida (Cav.) Hemsl. accepted as Simsia foetida (Cav.) S.F.Blake (original description)
Encelia grandiflora (Benth. ex Benth.) Hemsl. accepted as Simsia grandiflora Benth. (original description)
Encelia heterophylla (Kunth) Hemsl. accepted as Simsia amplexicaulis (Cav.) Pers. (original description)
Encelia hispida (Kunth) Hemsl. accepted as Simsia hispida (Kunth) Cass. (original description)
Encelia lagasceiformis (DC.) A.Gray ex Hemsl. (original description)
Encelia polycephala (Benth.) Hemsl. accepted as Simsia grandiflora Benth. (original description)
Encelia sanguinea (A.Gray) Hemsl. accepted as Simsia sanguinea A.Gray (original description)
Encelia sericea Hemsl. accepted as Simsia ghiesbreghtii (A.Gray) S.F.Blake (original description)
Encelia subaristata (A.Gray) A.Gray ex Hemsl. accepted as Simsia subaristata A.Gray (original description)
Eualcida Hemsl. (original description)
Eupatorium adenochaetum Sch.Bip. ex Hemsl. accepted as Ageratina adenachaenia (Sch.Bip. ex Klatt) R.M.King & H.Rob. (original description)
Eupatorium albicaule Sch.Bip. ex Hemsl. accepted as Koanophyllon albicaulis (Sch.Bip. ex Klatt) R.M.King & H.Rob. (original description)
Eupatorium album Hemsl. (original description)
Eupatorium betonicum (DC.) Hemsl. accepted as Conoclinium betonicifolium var. betonicifolium (Mill.) R.M.King & H.Rob. (original description)
Eupatorium daleoides (DC.) Hemsl. accepted as Critonia daleoides DC. (original description)
Eupatorium ehrenbergii Hemsl. accepted as Bartlettina macrocephala (Benth.) R.M.King & H.Rob. (original description)
Eupatorium hebebotrya Hemsl. (original description)
Eupatorium ianthinum (Morren) Hemsl. accepted as Bartlettina sordida (Less.) R.M.King & H.Rob. (original description)
Eupatorium liebmannii Hemsl. accepted as Decachaeta perornata (Klatt) R.M.King & H.Rob. (original description)
Eupatorium melanolepis Sch.Bip. ex Hemsl. (original description)
Eupatorium oligolepis (Kunze) Hemsl. accepted as Conoclinium betonicifolium (Mill.) R.M.King & H.Rob. (original description)
Eupatorium orizabae Sch.Bip. ex Hemsl. accepted as Ageratina glauca (Sch.Bip. ex Klatt) R.M.King & H.Rob. (original description)
Eupatorium popocatapetlense Schltdl. ex Hemsl. accepted as Ageratina ligustrina (DC.) R.M.King & H.Rob. (original description)
Eupatorium quinquesetosum Hemsl. accepted as Fleischmannia arguta (Kunth) B.L.Rob. (original description)
Eupatorium schaffneri Sch.Bip. ex Hemsl. (original description)
Eupatorium tepicanum (Hook. & Arn.) Hemsl. accepted as Critonia hebebotrya DC. (original description)
Gutierrezia coulteri Hemsl. accepted as Gutierrezia sphaerocephala A.Gray (original description)
Gymnolomia flava Hemsl. accepted as Viguiera flava (Hemsl.) S.F.Blake (original description)
Gymnolomia ghiesbreghtii Hemsl. accepted as Viguiera hemsleyana S.F.Blake (original description)
Gymnolomia multiflora (Nutt.) Benth. & Hook.f. ex Hemsl. accepted as Heliomeris multiflora var. multiflora Nutt. (original description)
Gymnolomia parkinsonii Hemsl. accepted as Viguiera parkinsonii (Hemsl.) S.F.Blake (original description)
Hamalium Hemsl. (original description)
Hebeclinium ehrenbergii Sch.Bip. ex Hemsl. (original description)
Hebeclinium liebmanniae Sch.Bip. ex Hemsl. (original description)
Helenium integrifolia Kunth (original description)
Helenium integrifolium (Kunth) Benth. & Hook.f. ex Hemsl. accepted as Dugaldia integrifolia (Kunth) Cass. (original description)
Helianthus mexicanus (Walp.) Hemsl. (original description)
Heliopsis annua Hemsl. (original description)
Heliopsis procumbens Hemsl. (original description)
Hymenatherum serratifolium (DC.) Hemsl. accepted as Gymnolaena serratifolia (DC.) Rydb. (original description)