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- strumosus, Helianthus tuberosus, Helianthus verticillatus, Helianthus ×laetiflorus Linnaeus Sp. Pl. 2: 904. 1753. , Gen. Pl. ed. 5, 386. 1754. Edward E.28 KB (884 words) - 20:11, 5 November 2020
- been applied to plants here called H. ×laetiflorus. Clevenger, S. and C. B. Heiser. 1963. Helianthus laetiflorus and Helianthus rigidus—hybrids or species4 KB (411 words) - 20:12, 5 November 2020
- names: Stiff sunflower hélianthe rigide Endemic Synonyms: Helianthus laetiflorus var. rigidus (Cassini) Fernald Helianthus rigidus (Cassini) Desfontaines3 KB (185 words) - 20:12, 5 November 2020
- subrhomboideus Rydberg Mem. New York Bot. Gard. 1: 419. 1900 Synonyms: Helianthus laetiflorus var. subrhomboideus (Rydberg) Fernald Helianthus pauciflorus var. sub3 KB (202 words) - 20:12, 5 November 2020
- streptanthifolius var. kluanei J. F. Bain Senecio streptanthifolius var. laetiflorus (Greene) J. F. Bain Senecio streptanthifolius var. oödes (Rydberg) J.7 KB (480 words) - 20:00, 5 November 2020
- hybridization with H. tuberosus. Hybrids with H. tuberosus are known as H. ×laetiflorus, which is frequently cultivated. None. Helianthus pauciflorus subsp. pauciflorus4 KB (340 words) - 18:25, 6 November 2020