Helianthus grosseserratus M. Martens (Q2755)

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Helianthus grosseserratus is a taxon with the rank species within the genus Helianthus
Language Label Description Also known as
English
Helianthus grosseserratus M. Martens
Helianthus grosseserratus is a taxon with the rank species within the genus Helianthus

    Statements

    taxon/id/Helianthus grosseserratus M. Martens
    0 references
    Helianthus grosseserratus M. Martens
    Helianthus grosseserratus
    M. Martens
    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 grosseserratus
    hélianthe à grosses dents (French)
    sawtooth sunflower (English)
    thick-toothed sunflower (English)
    Sawtooth sunflower (English)
    hélianthe à grosses dents (English)
    1 reference
    Douglas, G.W., G.B. Straley, D.V. Meidinger & J. Pojar. 1998. Illustrated Flora of British Columbia. B.C. Ministry of Environment, Lands & Parks and B.C. Ministry of Forests. Victoria. Crown Publications. 8 vols.
    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 late summer–fall.
    dry to wet prairies
    other open sites
    Stems erect, glabrous proximally, distally glabrate, scabrellous, or strigillose (glaucous).
    opposite (proximal) or alternate;
    petioles (1–) 2–5 cm;
    blades (light to dark green, 3-nerved distal to bases) lanceolate to lanceovate, 10–32 × (1.2–) 4–9 cm, bases cuneate, margins usually coarsely to shallowly serrate, rarely subentire (flat), abaxial faces puberulent to tomentulose, glanddotted.
    Peduncles 0.3–10 cm.
    Involucres broadly hemispheric, 15–25 mm diam.
    Phyllaries 25–30 (loose, spreading), lance-linear, 10–14 × 1.5–2.5 mm (subequal), (margins ± ciliate) apices attenuate, abaxial faces glabrous or puberulent, not glanddotted.
    Paleae 7–8 mm, entire or 3-toothed (apices acuminate, ± hairy).
    Ray-florets 14–20;
    laminae 23–40 mm.
    Disc-florets 100+;
    corollas 5–6 mm, lobes yellow;
    anthers dark-brown to black, appendages yellow.
    Cypselae 3–4 mm, glabrate;
    pappi of 2 aristate scales 1.9–2.5 mm. 2n = 34.