Difference between revisions of "Helianthus decapetalus Linnaeus (Q2752)"

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Latest revision as of 12:52, 24 June 2022

Helianthus decapetalus is a taxon with the rank species within the genus Helianthus
Language Label Description Also known as
English
Helianthus decapetalus Linnaeus
Helianthus decapetalus is a taxon with the rank species within the genus Helianthus

    Statements

    taxon/id/Helianthus decapetalus Linnaeus
    0 references
    Helianthus decapetalus Linnaeus
    Helianthus decapetalus
    Linnaeus
    FNA Editorial Committee. 2006. Flora of North America north of Mexico. Volume 21: Magnoliophyta: Asteridae, part 8: Asteraceae, part 3. Oxford University Press, New York.
    accepted
    Helianthus decapetalus
    hélianthe à dix rayons (French)
    ten-rayed sunflower (English)
    thin-leaved sunflower (English)
    Thinleaf sunflower (English)
    hélianthe à dix rayons (English)
    1 reference
    Hinds, H.R. 2000. Flora of New Brunswick : a manual for the identification of the vascular plants of New Brunswick. 2nd edition. Biology Department, University of New Brunswick, Fredericton. 699 pp.
    1 reference
    Newmaster, S.G., A. Lehela, M.J. Oldham, P.W.C. Uhlig & S. McMurray. 1998. Ontario Plant List. Ontario Forest Research Institute, Sault Ste. Marie, Ontario. Forest Information Paper No. 123. 550 pp.
    1 reference
    Marie-Victorin, Fr. 1995. Flore laurentienne. 3e éd. Mise à jour et annotée par L. Brouillet, S.G. Hay, I. Goulet, M. Blondeau, J. Cayouette et J. Labrecque. Gaétan Morin éditeur. 1093 pp.
    Flowering summer–fall.
    mesic to wet woodland edges
    Stems erect, glabrous.
    opposite (proximal or all) or alternate (distal);
    petioles (1–) 2–5 cm;
    blades (green, 3-nerved distal to bases) lanceolate to ovate, 7–21 × 4–10 cm, bases rounded to cuneate (often shortly decurrent onto petioles), margins usually serrate (moderately to notably in larger leaves), abaxial faces ± scabro-hispidulous, relatively sparsely glanddotted.
    Heads 3–6 (–10).
    Peduncles 2–12 cm (not glanddotted).
    Involucres hemispheric, 12–25 mm diam.
    Phyllaries 20–25 (often reflexed), lance-linear to lanceolate, 11–16 × 2–3 mm (sometimes leaflike, longest surpassing discs by 1/2+ their lengths), (margins ciliate) apices attenuate, abaxial faces strigillose to glabrate, not glanddotted.
    Paleae 8–10 mm, 3-toothed.
    Ray-florets 8–12;
    laminae 20–25 mm.
    Disc-florets 40+;
    corollas 6.5–7.2 mm, lobes yellow;
    anthers usually dark-brown to black (rarely reddish-brown), appendages dark or reddish-brown.
    Cypselae 3.5–5 mm;
    pappi of 2 aristate scales 3–4 mm. 2n = 34, 68.