Bidens 


Cite taxon page as 'WFO (2020): Bidens . Published on the Internet;http://www.worldfloraonline.org/taxon/wfo-4000004584. Accessed on: 08 Apr 2020'

General Information

"Heads radiate or discoid, the rays when present few, often 8, sterile, generally neutral, yellow or less often white or pink; invol bracts biseriate and dimorphic, the outer ± herbaceous, often very large, the inner membranous, often striate; receptacle flat or slightly convex, its bracts narrow, flat or nearly so; disk-fls perfect and fertile; style-branches flattened, with externally hairy, usually short appendage; achenes flattened parallel to the invol bracts, but not (or scarcely) winged, or sometimes almost regularly tetragonal, rarely subterete; pappus of (1)2–4(6) awns or teeth, commonly retrorsely barbed, but sometimes antrorsely barbed or even barbless, in a few spp. obsolete; herbs (ours) with opposite, simple to dissected lvs. 200, cosmop.Thelesperma megapotamicum (Spreng.) Kuntze, of the Great Plains, has been reported as adventive in Ill. and Mo. It is a glabrous perennial with the lvs once or twice pinnatifid into slender segments; the discoid (or inconspicuously radiate) heads terminate long, naked peduncles; the outer invol bracts are very short, and the inner ones are connate to the middle or above; the wingless achenes have a pappus of 2 retrorsely barbed awn-scales. (T. gracile)"

  • Provided by: [C].New York Botanical Garden
    • Source: [
    • 5
    • ]. 

    Morphology

    Achenes compressed or angled, striate-sulcate, ribbed, unmargined or margins narrowly winged or callose-thickened; at apex with or without aristae, aristae with or without antrorse and or retrorse barbs.

  • Provided by: [B].Plants Of the World Online Portal - FTEA
    • Source: [
    • 4
    • ]. 

    Capitula radiate, terminal, solitary or arranged in cymes; involucre of usually green outer phyllaries and variously coloured inner phyllaries; paleae membranous, usually oblong-linear, 2–many-striate

  • Provided by: [B].Plants Of the World Online Portal - FTEA
    • Source: [
    • 4
    • ]. 

    Ray florets neuter with aristate or exaristate ovary or pistillate and fertile with well developed achenes and aristae, rays yellow or orange, rarely white (B. pilosa L.) or lemon-yellow, striate; disc florets yellow to brownish, corolla 5-lobed

  • Provided by: [B].Plants Of the World Online Portal - FTEA
    • Source: [
    • 4
    • ]. 

    Leaves opposite, simple or variously compound with segments linear to broadly ovate

  • Provided by: [B].Plants Of the World Online Portal - FTEA
    • Source: [
    • 4
    • ]. 

    Annual or perennial herbs or shrubs

  • Provided by: [B].Plants Of the World Online Portal - FTEA
    • Source: [
    • 4
    • ]. 

    Included Species

      Bibliography

     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).
    Plants Of the World Online Portal - FTEA
    https://www.kew.org/science/who-we-are-and-what-we-do/strategic-outputs-2020/plants-of-the-world-online
    http://www.plantsoftheworldonline.org/terms-and-conditions
    • B
    New York Botanical Garden
    Descriptions of plants should be attributed to the full citation for each individual article, chapter or book that is the source for each record, which should include the authors of original publication.
    • C Content licensed under Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License
    World Flora Online consortium
    http://www.worldfloraonline.org/organisation/WFO
    World Flora Online Data. 2018.
    • D CC0 1.0 Universal (CC0 1.0).