Conyza attenuata var. hispidula Humbert (original description)
Helichrysum adhaerens var. leiophyllum Humbert (original description)
Helichrysum bracteiferum subsp. andringitranum Humbert (original description)
Helichrysum bracteiferum subsp. tsaratananense Humbert (original description)
Helichrysum fulvescens var. patulum (Baker) Humbert (original description)
Helichrysum madagascariense var. dunense Humbert (original description)
Helichrysum mirabile var. compactum Humbert (original description)
Iphiona ilicifolia Benth. ex Humbert (original description)
Pluchea tomentosa var. transiens Humbert (original description)
Psiadia altissima var. andringitrensis Humbert (original description)
Psiadia altissima var. decurrens (Klatt) Humbert (original description)
Psiadia altissima var. occidentalis Humbert (original description)
Psiadia altissima var. stenophylla (Baker) Humbert (original description)
Psiadia volubilis (DC.) Baill. ex Humbert (original description)
Senecio emirnensis var. angavonensis (Bojer ex DC.) Humbert (original description)
Senecio emirnensis var. vittarifolius (Bojer ex DC.) Humbert (original description)
Senecio madagascariensis var. boutonii (Baker) Humbert (original description)
Senecio myricaefolius (Bojer ex DC.) (original description)
Senecio myricaefolius var. discoideus Humbert (original description)
Senecio penicillatus var. glabrescens Humbert (original description)
Senecio rosellatus var. olivaceus (Klatt) Humbert accepted as Senecio olivaceus Klatt (original description)
Sigesbeckia bojeri (DC.) Humbert (original description)
Wedelia elongata var. cuneata Humbert (original description)