Aster saboureaui Humbert accepted as Madagaster saboureaui (Humbert) G.L.Nesom (original description)
Chrysogonum perrieri (Humbert) Humbert (original description)
Conyza neocandolleana Humbert (original description)
Crassocephalum lemuricum (Humbert) Humbert (original description)
Crassocephalum luteum (Humbert) Humbert accepted as Crassocephalum montuosum (S.Moore) Milne-Redh. (original description)
Crassocephalum manampanihense (Humbert) Humbert (original description)
Crassocephalum sonchifolium (Baker) Humbert (original description)
Epallage longipes Humbert (original description)
Erigeron naudinii (Bonnet) Humbert accepted as Erigeron sumatrensis Retz. (original description)
Helichrysum leptocephalum (DC.) Humbert (original description)
Launaea pauciflora (Baker) Humbert & Boulos accepted as Launaea rarifolia (Oliv. & Hiern) Boulos (original description)
Launaea rogersii (Humbert) Humbert & Boulos (original description)
Oliganthes bathiaei (Humbert) Humbert (original description)
Oliganthes lanuginosa (Bojer ex DC.) Humbert (original description)
Oliganthes lecomtei (Humbert) Humbert (original description)
Oliganthes pseudocentauropsis (Humbert) Humbert (original description)
Oliganthes sublanata (Drake) Humbert (original description)
Psiadia angustifolia (Humbert) Humbert (original description)
Psiadia cacuminum (Humbert) Humbert (original description)
Psiadia coarctata (Humbert) Humbert (original description)
Psiadia marojejyensis (Humbert) Humbert (original description)
Psiadia serrata (Humbert) Humbert (original description)
Senecio baronii Humbert (original description)
Senecio marnieri Humbert (original description)
Senecio neobakeri Humbert (original description)
Senecio sakamaliensis (Humbert) Humbert (original description)
Sonchus gigas Boulos ex Humbert (original description)
Vernonia grandis (DC.) Humhert (original description)
Vernonia latisquamata (Humbert) Humbert (original description)