Aspilia hispidula var. angustifolia Hassl. accepted as Wedelia hispidula (Baker) J.U.Santos (original description)
Bidens riedelii var. hirsutus Hassl. accepted as Bidens hassleriana (Chodat) A.A.Sáenz (original description)
Blainvillea biaristata f. multiflora Hassl. accepted as Calyptocarpus biaristatus (DC.) H.Rob. (original description)
Blainvillea biaristata f. scaberula Hassl. accepted as Calyptocarpus biaristatus (DC.) H.Rob. (original description)
Calea asclepiifolia Hassl. (original description)
Calea chodatii Hassl. (original description)
Calea chodatii var. intermedia Hassl. accepted as Calea chodatii Hassl. (original description)
Eupatorium alternifolium f. asperum Hassl. accepted as Gyptis crassipes (Hieron.) R.M.King & H.Rob. (original description)
Eupatorium alternifolium f. deltoideum Hassl. (original description)
Eupatorium alternifolium f. densifolium Hassl. (original description)
Eupatorium alternifolium f. dentatum Hassl. (original description)
Eupatorium alternifolium f. genuinum Hassl. (original description)
Eupatorium alternifolium f. lactevirens Hassl. (original description)
Eupatorium alternifolium f. molle Hassl. (original description)
Eupatorium alternifolium f. oblongifolium Hassl. (original description)
Eupatorium alternifolium f. pseudogenuinum Hassl. (original description)
Eupatorium alternifolium f. subintegrum Hassl. (original description)
Eupatorium alternifolium subsp. crassipes Hassl. (original description)
Eupatorium alternifolium var. aureo-viride (Chodat) Hassl. (original description)
Eupatorium alternifolium var. glabrum Hassl. (original description)
Eupatorium alternifolium var. hieronymi Hassl. (original description)
Eupatorium alternifolium var. hispidulum Hassl. accepted as Gyptis lanigera (Hook. & Arn.) R.M.King & H.Rob. (original description)
Eupatorium alternifolium var. vernoniopsis (Sch.Bip. ex Baker) Hassl. accepted as Gyptis vernoniopsis (Sch.Bip. ex Baker) R.M.King & H.Rob. (original description)
Eupatorium caaguazuense var. genuinum Hassl. accepted as Chromolaena caaguazuensis (Hieron.) R.M.King & H.Rob. (original description)
Eupatorium crenulatum var. tremulum (Hook. & Arn.) Hassl. accepted as Raulinoreitzia tremula (Hook. & Arn.) R.M.King & H.Rob. (new combination reference)
Eupatorium hirsutum var. bartsiifolium Hassl. (original description)
Eupatorium ivifolium var. genuinum Hassl. accepted as Chromolaena ivifolia (L.) R.M.King & H.Rob. (original description)
Eupatorium ivifolium var. hirsutum Hassl. accepted as Chromolaena ivifolia (L.) R.M.King & H.Rob. (original description)
Eupatorium ivifolium var. pilcomayense Hassl. accepted as Chromolaena ivifolia (L.) R.M.King & H.Rob. (original description)
Eupatorium laevigatum f. crenatifolium Hassl. (original description)
Eupatorium laevigatum var. genuinum Hassl. (original description)
Eupatorium laevigatum var. psidiifolium Hassl. (original description)
Eupatorium lysimachioides var. estrellense (Hassl.) Hassl. accepted as Heterocondylus lysimachioides (Chodat) R.M.King & H.Rob. (original description)
Eupatorium macrocephalum var. stigmatosum (Chodat) Hassl. accepted as Campuloclinium macrocephalum (Less.) DC. (original description)
Eupatorium margaritense (Hassl.) Hassl. accepted as Chromolaena margaritensis (Hassl.) R.M.King & H.Rob. (original description)
Eupatorium oxylepis var. densiflorum (Morong) Hassl. accepted as Chromolaena densiflora (Morong) R.M.King & H.Rob. (original description)
Eupatorium paraguariense Chodat (original description)
Eupatorium verbenaceum f. intermedia Hassl. accepted as Chromolaena verbenacea (DC.) R.M.King & H.Rob. (original description)
Eupatorium verbenaceum var. genuinum Hassl. accepted as Chromolaena verbenacea (DC.) R.M.King & H.Rob. (original description)
Eupatorium verbenaceum var. rhodolepis (Chodat) Hassl. accepted as Chromolaena verbenacea (DC.) R.M.King & H.Rob. (original description)
Eupatorium verbenaceum var. scaberrimum Hassl. accepted as Chromolaena verbenacea (DC.) R.M.King & H.Rob. (original description)
Isostigma peucedanifolium f. discoidea Hassl. accepted as Isostigma speciosum Less. (original description)
Isostigma peucedanifolium f. radiata Hassl. accepted as Isostigma speciosum Less. (original description)
Isostigma peucedanifolium var. dissitifolium (Baker) Hassl. accepted as Isostigma dissitifolium Baker (original description)
Isostigma peucedanifolium var. genuinum Hassl. (original description)
Mikania anisodora Hassl. (original description)
Mikania guaranitica Hassl. (original description)
Mikania sapucayensis Hassl. accepted as Mikania variifolia Hieron. (original description)
Oyedaea annua Hassl. accepted as Dimerostemma annuum (Hassl.) H.Rob. (original description)
Salmea scandens subsp. paraguariensis Hassl. accepted as Salmea scandens (L.) DC. (original description)
Salmea scandens var. genuina Hassl. (original description)
Spilanthes glaberrima Hassl. accepted as Acmella glaberrima (Hassl.) R.K.Jansen (original description)
Spilanthes urens f. ciliatifolia Hassl. accepted as Spilanthes nervosa Chodat (original description)
Spilanthes urens var. nervosa (Chodat) Hassl. accepted as Spilanthes nervosa Chodat (original description)
Spilanthes urens var. typica Hassl. accepted as Spilanthes paraguayensis R.K.Jansen (original description)
Synedrellopsis grisebachii f. reducta Hassl. (original description)
Synedrellopsis grisebachii var. inversa Hassl. (original description)
Trichogonia menthaefolia var. genuina Hassl. (original description)
Trichogonia menthifolia f. attenutata Hassl. accepted as Trichogonia hassleri Mattf. (original description)
Trichogonia menthifolia f. cordata Hassl. accepted as Trichogonia hassleri Mattf. (original description)
Trichogonia menthifolia var. martii Hassl. (original description)
Trichogonia menthifolia var. tomentosula Hassl. (original description)
Trichogonia salviifolia f. linearifolia Hassl. accepted as Trichogonia fiebrigii Mattf. accepted as Trichogonia salviifolia Gardner (original description)
Trichogonia salviifolia f. microphylla Hassl. accepted as Trichogonia fiebrigii Mattf. accepted as Trichogonia salviifolia Gardner (original description)
Trichogonia salviifolia f. typica Hassl. (original description)
Verbesina diversifolia subsp. macrantha Hassl. (original description)
Viguiera macrorhiza f. hassleriana Hassl. (original description)
Viguiera robusta var. confusa Hassl. (original description)
Viguiera robusta var. scaberrima Hassl. (original description)
Viguiera salicifolia Hassl. accepted as Viguiera pilosa Baker (original description)
Viguiera speciosa Hassl. (original description)
Viguiera tuberosa f. angustifolia Hassl. (original description)
Viguiera tuberosa f. breviaristata Hassl. (original description)
Viguiera tuberosa f. calvata Hassl. (original description)
Viguiera tuberosa f. major Hassl. (original description)
Viguiera tuberosa f. scaberula Hassl. (original description)
Viguiera tuberosa var. guaranitica Hassl. (original description)
Viguiera tuberosa var. maxima Hassl. (original description)
Wedelia longepetiolata Hassl. accepted as Wedelia kerrii N.E.Br. (original description)
Wedelia macrodonta var. parviflora Hassl. (original description)
Wedelia pilosa var. brachycarpa (Baker) Hassl. accepted as Sphagneticola brachycarpa (Baker) Pruski (original description)
Wedelia pilosa var. genuina Hassl. (original description)
Zexmenia apensis (Chodat) Hassl. accepted as Angelphytum apense (Chodat) Pruski (original description)
Zexmenia arnottii (Baker) Hassl. accepted as Dimerostemma arnottii (Baker) M.D.Moraes (original description)
Zexmenia arnottii f. angustifolia Hassl. (original description)
Zexmenia arnottii f. angustissima Hassl. (original description)
Zexmenia arnottii f. asperrima Hassl. (original description)
Zexmenia arnottii f. calvescens Hassl. (original description)
Zexmenia arnottii f. densifolia Hassl. (original description)
Zexmenia arnottii f. dubia Hassl. (original description)
Zexmenia arnottii f. genuina Hassl. (original description)
Zexmenia arnottii f. graminifolia Hassl. (original description)
Zexmenia arnottii f. grisea Hassl. (original description)
Zexmenia arnottii f. guaranitica (Chodat) Hassl. accepted as Verbesina guaranitica Chodat (original description)
Zexmenia arnottii f. intermedia Hassl. (original description)
Zexmenia arnottii f. latifolia Hassl. (original description)
Zexmenia arnottii f. macrocephala Hassl. (original description)
Zexmenia arnottii f. rupestris Hassl. (original description)
Zexmenia arnottii f. sericea Hassl. (original description)
Zexmenia arnottii f. subimbricata Hassl. (original description)