Difference between revisions of "Helianthus pauciflorus Nuttall (Q2765)"

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Latest revision as of 12:52, 24 June 2022

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

    Statements

    taxon/id/Helianthus pauciflorus Nuttall
    0 references
    Helianthus pauciflorus Nuttall
    Helianthus pauciflorus
    Nuttall
    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 pauciflorus
    stiff sunflower (English)
    rigid sunflower (English)
    hélianthe raide (French)
    Stems erect, scabro-hispid.
    Leaves mostly basal;
    opposite, or opposite (proximal) and alternate;
    petioles 0–1 cm;
    blades lanceovate to oblong-lanceolate, or rhombic-ovate to lance-linear, 5–27 × 2–6 cm, bases cuneate, margins serrate to subentire, abaxial faces sparsely hispid, sparsely, if at all, glanddotted (cauline smaller).
    Peduncles 3–12 cm.
    Involucres hemispheric, 15–23 mm diam.
    Phyllaries 25–35, ovate, 6–10 × 3–5 mm, (margins ciliate) apices acute, abaxial faces glabrate to hispid.
    Paleae 9–10 mm, shallowly 3-toothed to subentire (apices ciliate, hairy).
    Ray-florets 10–20;
    laminae 20–35 mm (abaxial faces usually glanddotted).
    Disc-florets 75+;
    corollas 6.5–7 mm, lobes usually reddish, sometimes yellow;
    anthers dark, appendages dark (style-branches yellow).
    Cypselae 5–6 mm, glabrate;
    pappi of 2 aristate scales 4.5–5 mm plus 1–4 smaller aristate scales 0.3–2 mm. 2n = 102 (subspecies unknown).