Helianthus alienus E.Watson accepted as Helianthus giganteus L. (original description)
Helianthus ambulans E.Watson (original description)
Helianthus arenicola E.Watson (original description)
Helianthus attenuatus E.Watson (original description)
Helianthus borealis E.Watson accepted as Helianthus giganteus L. (original description)
Helianthus bracteatus E.Watson (original description)
Helianthus brevifolius E.Watson (original description)
Helianthus chartaceus E.Watson (original description)
Helianthus elegans E.Watson (original description)
Helianthus exasperatus E.Watson (original description)
Helianthus excubitor E.Watson (original description)
Helianthus floribundus E.Watson accepted as Aldama australis (S.F.Blake) E.E.Schill. & Panero (original description)
Helianthus formosus E.Watson (original description)
Helianthus instabilis E.Watson accepted as Helianthus grosseserratus M.Martens (original description)
Helianthus leoninus E.Watson (original description)
Helianthus littoralis Chapman ex E.Watson (original description)
Helianthus luxurians E.Watson (original description)
Helianthus membranaceus E.Watson (original description)
Helianthus mollissimus E.Watson (original description)
Helianthus montanus E.Watson accepted as Helianthus strumosus L. (original description)
Helianthus plantagineus (Torr. & A.Gray) E.Watson accepted as Helianthus occidentalis subsp. plantagineus (Torr. & A.Gray) Heiser (original description)
Helianthus praetermissus E.Watson (original description)
Helianthus reindutus (E.S.Steele) E.Watson accepted as Helianthus laevigatus Torr. & A.Gray (original description)
Helianthus severus E.Watson accepted as Helianthus laetiflorus Pers. (original description)
Helianthus simulans E.Watson (original description)
Helianthus stenophyllus (Torr. & A.Gray) E.Watson accepted as Helianthus hirsutus Raf. (original description)
Helianthus subcanescens (A.Gray) E.Watson (original description)
Helianthus superbus E.Watson accepted as Helianthus laetiflorus Pers. (original description)
Helianthus validus E.Watson accepted as Helianthus giganteus L. (original description)
Helianthus vernalis E.Watson (original description)
Helianthus vestitus E.Watson accepted as Helianthus debilis subsp. vestitus (E.Watson) Heiser (original description)
Helianthus virilis E.Watson (original description)