Helenium thurberi A.Gray
  • Proc. Amer. Acad. Arts xix. (1883) 32.


Cite taxon page as 'WFO (2021): Helenium thurberi A.Gray. Published on the Internet;http://www.worldfloraonline.org/taxon/wfo-0000133124. Accessed on: 23 Oct 2021'

General Information

Annuals, 40–100 cm. Stems usually 1, branched distally, moderately winged, sparsely hairy proximally, moderately hairy distally. Leaves glabrous or sparsely hairy (basal leaves withered by flowering); proximal blades lanceolate to lance-linear, usually irregularly laciniate; mid and distal blades lance-linear, entire. Heads 10–75(–120+) per plant, in paniculiform arrays. Peduncles 3–10 cm, moderately hairy. Involucres ovoid to conic, 6–10 × 5–10 mm. Phyllaries (strongly connate proximally), moderately hairy. Ray florets 0. Disc florets 225–500+; corollas yellow-green proximally, brown to reddish brown distally, 1–1.3 mm, lobes 4. Cypselae 0.9–1.2(–1.5) mm, moderately hairy; pappi of 6(–7) entire, non-aristate scales 0.2–0.5 mm. 2n = 26.

  • Provided by: [B].Flora of North America @ efloras.org
    • Source: [
    • 1
    • ]. 

     Information From

    Compositae
    CC0 1.0 Universal (CC0 1.0). https://creativecommons.org/publicdomain/zero/1.0
    • A CC0 1.0 Universal (CC0 1.0).
    Flora of North America @ efloras.org
    http://www.efloras.org/flora_page.aspx?flora_id=1
    'Flora of North America @ eFloras (2008). Published on the Internet http://www.efloras.org/flora_page.aspx?flora_id=1 [accessed August 2016]' Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
    • B Flora of North America Association
    World Flora Online consortium
    http://www.worldfloraonline.org/organisation/WFO
    World Flora Online Data. 2018.
    • C CC0 1.0 Universal (CC0 1.0).