Ageratina acutidentata (B.L.Rob.) R.M.King & H.Rob. (original description)
Ageratina adenachaenia (Sch.Bip. ex Klatt) R.M.King & H.Rob. (original description)
Ageratina adenophora (Spreng.) R.M.King & H.Rob. (original description)
Ageratina aegirophylla (B.L.Rob.) R.M.King & H.Rob. (original description)
Ageratina altissima (L.) R.M.King & H.Rob. (original description)
Ageratina amblyolepis (B.L.Rob.) R.M.King & H.Rob. (original description)
Ageratina ampla (Benth.) R.M.King & H.Rob. (original description)
Ageratina angustifolia (Kunth) R.M.King & H.Rob. accepted as Ageratina asclepiadea (L.f.) R.M.King & H.Rob. (original description)
Ageratina anisochroma (Klatt) R.M.King & H.Rob. (original description)
Ageratina apollinairei (B.L.Rob.) R.M.King & H.Rob. (original description)
Ageratina arbutifolia (Benth.) R.M.King & H.Rob. (original description)
Ageratina aristei (B.L.Rob.) R.M.King & H.Rob. (original description)
Ageratina arsenei (B.L.Rob.) R.M.King & H.Rob. (original description)
Ageratina articulata (Sch.Bip. ex Hieron.) R.M.King & H.Rob. accepted as Ageratina pichinchensis (Kunth) R.M.King & H.Rob. (original description)
Ageratina aschenborniana (S.Schauer) R.M.King & H.Rob. accepted as Ageratina pichinchensis (Kunth) R.M.King & H.Rob. (original description)
Ageratina atrocordata (B.L.Rob.) R.M.King & H.Rob. (original description)
Ageratina azangaroensis (Sch.Bip. ex Wedd.) R.M.King & H.Rob. accepted as Ageratina glechonophylla (Less.) R.M.King & H.Rob. (original description)
Ageratina baccharoides (Kunth) R.M.King & H.Rob. (original description)
Ageratina badia (Klatt) R.M.King & H.Rob. (original description)
Ageratina bellidifolia (Benth.) R.M.King & H.Rob. (original description)
Ageratina betulifolia (Greene) R.M.King & H.Rob. accepted as Ageratina herbacea (A.Gray) R.M.King & H.Rob. (original description)
Ageratina bimatra (Standl. & L.O.Williams) R.M.King & H.Rob. accepted as Fleischmannia microstemon (Cass.) R.M.King & H.Rob. (original description)
Ageratina blepharilepis (Sch.Bip.) R.M.King & H.Rob. (original description)
Ageratina brandegeeana (B.L.Rob.) R.M.King & H.Rob. (original description)
Ageratina brevipes (DC.) R.M.King & H.Rob. (original description)
Ageratina bustamenta (DC.) R.M.King & H.Rob. accepted as Ageratina pichinchensis (Kunth) R.M.King & H.Rob. (original description)
Ageratina caeciliae (B.L.Rob.) R.M.King & H.Rob. (original description)
Ageratina calaminthifolia (Kunth) R.M.King & H.Rob. accepted as Ageratina calaminthaefolia (Kunth) R.M.King & H.Rob. (original description)
Ageratina calderillensis (Hieron.) R.M.King & H.Rob. (original description)
Ageratina calophylla (B.L.Rob.) R.M.King & H.Rob. (original description)
Ageratina camachensis (Hieron.) R.M.King & H.Rob. (original description)
Ageratina campyloclada (B.L.Rob.) R.M.King & H.Rob. (original description)
Ageratina cardiophylla (B.L.Rob.) R.M.King & H.Rob. (original description)
Ageratina chachapoyasensis (Cuatrec.) R.M.King & H.Rob. (original description)
Ageratina chapalensis (S.Watson) R.M.King & H.Rob. accepted as Ageratina lasioneura (Hook. & Arn.) R.M.King & H.Rob. (original description)
Ageratina chiapensis (B.L.Rob.) R.M.King & H.Rob. accepted as Ageratina vernalis (Vatke & Kurtz) R.M.King & H.Rob. (original description)
Ageratina chiriquensis (B.L.Rob.) R.M.King & H.Rob. (original description)
Ageratina choricephala (B.L.Rob.) R.M.King & H.Rob. (original description)
Ageratina choricephaloides (B.L.Rob.) R.M.King & H.Rob. (original description)
Ageratina ciliata (Less.) R.M.King & H.Rob. (original description)
Ageratina collodes (B.L.Rob. & Greenm.) R.M.King & H.Rob. (original description)
Ageratina conspicua (Kunth & C.D.Bouché) R.M.King & H.Rob. accepted as Ageratina grandifolia (Regel) R.M.King & H.Rob. (original description)
Ageratina corylifolia (Griseb.) R.M.King & H.Rob. (original description)
Ageratina crassiceps (B.L.Rob.) R.M.King & H.Rob. (original description)
Ageratina crassiramea (B.L.Rob.) R.M.King & H.Rob. accepted as Pachythamnus crassirameus (B.L.Rob.) R.M.King & H.Rob. (original description)
Ageratina cremasta (B.L.Rob.) R.M.King & H.Rob. (original description)
Ageratina crenaea (B.L.Rob.) R.M.King & H.Rob. (original description)
Ageratina cuencana (B.L.Rob.) R.M.King & H.Rob. (original description)
Ageratina cutervensis (Hieron.) R.M.King & H.Rob. (original description)
Ageratina cuzcoensis (Hieron.) R.M.King & H.Rob. (original description)
Ageratina dasyneura (B.L.Rob.) R.M.King & H.Rob. (original description)
Ageratina deltoidea (Jacq.) R.M.King & H.Rob. (original description)
Ageratina dendroides (Spreng.) R.M.King & H.Rob. (original description)
Ageratina desquamans (B.L.Rob.) R.M.King & H.Rob. (original description)
Ageratina dictyoneura (Urb.) R.M.King & H.Rob. (original description)
Ageratina dombeyana (DC.) R.M.King & H.Rob. (original description)
Ageratina durangensis (B.L.Rob.) R.M.King & H.Rob. (original description)
Ageratina elegans (Kunth) R.M.King & H.Rob. (original description)
Ageratina enixa (B.L.Rob.) R.M.King & H.Rob. (original description)
Ageratina espinosarum (A.Gray) R.M.King & H.Rob. (original description)
Ageratina etlensis (B.L.Rob.) R.M.King & H.Rob. (original description)
Ageratina exserto-venosa (Klatt) R.M.King & H.Rob. accepted as Ageratina fastigiata (Kunth) R.M.King & H.Rob. (original description)
Ageratina fastigiata (Kunth) R.M.King & H.Rob. (original description)
Ageratina flaviseta (B.L.Rob.) R.M.King & H.Rob. (original description)
Ageratina funckii (B.L.Rob.) R.M.King & H.Rob. (original description)
Ageratina gilbertii (B.L.Rob.) R.M.King & H.Rob. (original description)
Ageratina glabrata (Kunth) R.M.King & H.Rob. (original description)
Ageratina glandulifera (Hieron.) R.M.King & H.Rob. (original description)
Ageratina glauca (Sch.Bip. ex Klatt) R.M.King & H.Rob. (original description)
Ageratina glechonophylla (Less.) R.M.King & H.Rob. (original description)
Ageratina glischra (B.L.Rob.) R.M.King & H.Rob. (original description)
Ageratina gloeoclada (B.L.Rob.) R.M.King & H.Rob. (original description)
Ageratina glyptophlebia (B.L.Rob.) R.M.King & H.Rob. (original description)
Ageratina gracilenta (B.L.Rob.) R.M.King & H.Rob. (original description)
Ageratina gracilis (Kunth) R.M.King & H.Rob. (original description)
Ageratina grandidentata (DC.) R.M.King & H.Rob. accepted as Ageratina pazcuarensis (Kunth) R.M.King & H.Rob. (original description)
Ageratina gynoxoides (Wedd.) R.M.King & H.Rob. (original description)
Ageratina hartii (Urb.) R.M.King & H.Rob. (original description)
Ageratina havanensis (Kunth) R.M.King & H.Rob. (original description)
Ageratina hebes (B.L.Rob.) R.M.King & H.Rob. (original description)
Ageratina hederifolia (A.Gray) R.M.King & H.Rob. (original description)
Ageratina herbacea (A.Gray) R.M.King & H.Rob. (original description)
Ageratina hidalgensis (B.L.Rob.) R.M.King & H.Rob. (original description)
Ageratina humboldtii (Hieron.) R.M.King & H.Rob. accepted as Ageratina asclepiadea (L.f.) R.M.King & H.Rob. (original description)
Ageratina hyssopina (A.Gray) R.M.King & H.Rob. (original description)
Ageratina ibaquensis (Sch.Bip. ex Hieron.) R.M.King & H.Rob. (original description)
Ageratina illita (Urb.) R.M.King & H.Rob. (original description)
Ageratina intercostulata (B.L.Rob.) R.M.King & H.Rob. (original description)
Ageratina iodotricha (B.L.Rob.) R.M.King & H.Rob. (original description)
Ageratina irrasa (B.L.Rob.) R.M.King & H.Rob. (original description)
Ageratina isolepis (B.L.Rob.) R.M.King & H.Rob. (original description)
Ageratina ixiocladon R.M.King & H.Rob. (original description)
Ageratina jahnii (B.L.Rob.) R.M.King & H.Rob. (original description)
Ageratina kupperi (Suess.) R.M.King & H.Rob. (original description)
Ageratina lasia (B.L.Rob.) R.M.King & H.Rob. (original description)
Ageratina lemmonii (B.L.Rob.) R.M.King & H.Rob. (original description)
Ageratina leptodictyon (A.Gray) R.M.King & H.Rob. (original description)
Ageratina liebmannii (Sch.Bip. ex Klatt) R.M.King & H.Rob. (original description)
Ageratina ligustrina (DC.) R.M.King & H.Rob. (original description)
Ageratina lobulifera (B.L.Rob.) R.M.King & H.Rob. (original description)