Helianthus 


Cite taxon page as 'WFO (2021): Helianthus . Published on the Internet;http://www.worldfloraonline.org/taxon/wfo-4000017208. Accessed on: 17 Oct 2021'

General Information

"Heads radiate, the rays large, yellow, neutral; invol bracts subequal to imbricate, usually green; receptacle flat to low-conic, chaffy, its bracts clasping the achenes; disk-fls perfect and fertile; style-branches flattened, hispidulous on both sides (at least distally), the stigmatic lines poorly developed; achenes thick, moderately compressed at right angles to the invol bracts, glabrous or sometimes hairy; pappus of 2 readily deciduous awns with enlarged, thin, paleaceous base, rarely with some additional short scales; coarse annual or more often perennial herbs with simple lvs, at least the lowermost ones opposite; x=17. 50, N. Amer. Hybrids abound."

  • Provided by: [B].New York Botanical Garden
    • Source: [
    • 1
    • ]. 

    Included Species

      Bibliography

    • 1 "Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp."

     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).
    New York Botanical Garden
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    World Flora Online consortium
    http://www.worldfloraonline.org/organisation/WFO
    World Flora Online Data. 2018.
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