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Family: Asteraceae
  Genus: Helianthus

    Helianthus annuus L.*+

        common sunflower, garden sunflower
             Helianthus annuus L. subsp. jaegeri
             Helianthus annuus L. subsp. lenticularis
             Helianthus annuus L. subsp. texanus
             Helianthus annuus L. var. annuus
             Helianthus annuus L. var. lenticularis (Douglas ex Lindl.) Steyerm.
             Helianthus annuus L. var. macrocarpus (DC.) Cockerell
             Helianthus annuus L. var. texanus (Heiser) Shinners
             Helianthus aridus Rydb.
             Helianthus lenticularis Douglas ex Lindl.
    Helianthus decapetalus L.+

        forest sunflower, pale sunflower, thin-leaved sunflower
             Helianthus scrophulariifolius Britton
             Helianthus tracheliifolius Mill.
    Helianthus divaricatus L.*+

        divaricate sunflower, woodland sunflower
             Helianthus divaricatus L. var. angustifolius Kuntze
    Helianthus giganteus L.*+

        giant sunflower, swamp sunflower, tall sunflower
             Helianthus alienus E.Watson
             Helianthus borealis E.Watson
             Helianthus exasperatus E.Watson
             Helianthus giganteus L. subsp. alienus
             Helianthus giganteus L. var. subtuberosus Britton
             Helianthus membranaceus E.Watson
             Helianthus nuttallii Torr. & A.Gray var. subtuberosus (Britton) B.Boivin
             Helianthus subtuberosus (Britton) Britton
             Helianthus validus E.Watson
    Helianthus giganteus L. X H. grosseserratus M.Martens
        
    Helianthus giganteus L. X H. maximilianii Schrad.+

        
    Helianthus grosseserratus M.Martens*+

        saw-tooth sunflower
             Helianthus grosseserratus M.Martens f. plenifolius Wadmond
             Helianthus grosseserratus M.Martens subsp. maximus
             Helianthus grosseserratus M.Martens var. hypoleucus A.Gray
             Helianthus instabilis E.Watson
    Helianthus grosseserratus M.Martens X H. occidentalis Riddell+

        
    Helianthus hirsutus Raf.+

        hairy sunflower, oblong sunflower, rough sunflower
             Helianthus hirsutus Raf. var. stenophyllus Torr. & A.Gray
             Helianthus hirsutus Raf. var. trachyphyllus Torr. & A.Gray
             Helianthus stenophyllus (Torr. & A.Gray) E.Watson
    Helianthus maximilianii Schrad.*+

        Maximilian's sunflower
             Helianthus dalyi Britton
    Helianthus mollis Lam.*+

        ashy sunflower, downy sunflower, soft sunflower
             Helianthus mollis Lam. var. cordatus S.Watson
    Helianthus occidentalis Riddell
        few-leaved sunflower, naked-stemmed sunflower, western sunflower
    Helianthus occidentalis Riddell subsp. occidentalis*+

        few-leaved sunflower, naked-stemmed sunflower, western sunflower
             Helianthus dowellianus M.A.Curtis
             Helianthus occidentalis Riddell var. dowellianus (M.A.Curtis) Torr. & A.Gray
             Helianthus occidentalis Riddell var. occidentalis
    Helianthus pauciflorus Nutt.*+

        few-leaved sunflower, stiff sunflower
    Helianthus pauciflorus Nutt. subsp. pauciflorus+

        few-leaved sunflower, prairie sunflower, stiff sunflower
             Helianthus laetiflorus Pers. var. rigidus (Cass.) Fernald
             Helianthus pauciflorus Nutt. var. pauciflorus
             Helianthus rigidus (Cass.) Desf.
             Helianthus rigidus (Cass.) Desf. f. flavus Deam
             Helianthus rigidus (Cass.) Desf. subsp. rigidus
             Helianthus rigidus (Cass.) Desf. var. rigidus
    Helianthus pauciflorus Nutt. subsp. subrhomboideus+

        few-leaved sunflower, stiff sunflower
             Helianthus laetiflorus Pers. var. subrhomboideus (Rydb.) Fernald
             Helianthus rigidus (Cass.) Desf. subsp. laetiflorus
             Helianthus rigidus (Cass.) Desf. subsp. subrhomboideus
             Helianthus rigidus (Cass.) Desf. var. subrhomboideus (Rydb.) Cronquist
             Helianthus subrhomboideus Rydb.
    Helianthus petiolaris Nutt.
        petioled sunflower, plains sunflower, prairie sunflower
    Helianthus petiolaris Nutt. subsp. petiolaris*+

        petioled sunflower, plains sunflower, prairie sunflower
    Helianthus salicifolius A.Dietr.+

        willow-leaved sunflower
             Helianthus filiformis Small
             Helianthus orgyalis DC.
    Helianthus strumosus L.*+

        pale-leaved woodland sunflower, rough-leaved sunflower
             Helianthus montanus E.Watson
             Helianthus saxicola Small
    Helianthus tuberosus L.*+

        Jerusalem-artichoke, woodland sunflower
             Helianthus subcanescens (A.Gray) E.Watson
             Helianthus tomentosus Michx.
             Helianthus tuberosus L. var. subcanescens A.Gray
    Helianthus X ambiguus (A.Gray) Britton (pro sp.) X +

        ambiguous sunflower
    Helianthus X intermedius R.W.Long X +

        intermediate sunflower
    Helianthus X kellermani Britton (pro sp.) X +

        Kellerman's sunflower
    Helianthus X laetiflorus Pers. (pro sp.) X *+

        cheerful sunflower, hybrid prairie sunflower, mountain sunflower
             Helianthus laetiflorus Pers.
             Helianthus scaberrimus Elliott
    Helianthus X luxurians E.Watson (pro sp.) X +

        luxuriant sunflower
    Helianthus X multiflorus L. (pro sp.) X
        many-flowered sunflower
             Helianthus multiflorus L.

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