Brachyclados megalanthus Speg. (original description)
Chuquiraga argentea (Speg.) Speg. accepted as Chuquiraga morenonis (Kuntze) C.Ezcurra (original description)
Chuquiraga argentea var. dusenii (O.Hoffm.) Speg. accepted as Chuquiraga avellanedae Lorentz (original description)
Doniophyton argenteum Speg. accepted as Chuquiraga morenonis (Kuntze) C.Ezcurra (original description)
Leucheria eriocephala Speg. (original description)
Nassauvia axillaris var. contracta Speg. accepted as Nassauvia glomerulosa (Lag. ex Lindl.) D.Don (original description)
Nassauvia patagonica var. elatior Speg. accepted as Nassauvia ulicina (Hook.f.) Macloskie (original description)
Nassauvia pentacaenoides Speg. (original description)
Nassauvia struthionum Phil. (original description)
Nassauvia struthionum var. robusta Speg. (original description)
Senecio ameghinoi Speg. (original description)
Senecio capillarifolius Speg. accepted as Senecio chrysocomoides Hook. & Arn. (original description)
Senecio choiquelauensis Speg. (original description)
Senecio chubutensis Speg. accepted as Senecio chrysocomoides Hook. & Arn. (original description)
Senecio colu-huapiensis Speg. (original description)
Senecio diabolicus Speg. (original description)
Senecio inutilis Speg. accepted as Senecio bracteolatus Hook. & Arn. (original description)
Senecio julianus Speg. (original description)
Senecio mustersi Speg. (original description)