Helianthus nuttallii Torrey & A. Gray (Q2762)

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Helianthus nuttallii is a taxon with the rank species within the genus Helianthus
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English
Helianthus nuttallii Torrey & A. Gray
Helianthus nuttallii is a taxon with the rank species within the genus Helianthus

    Statements

    taxon/id/Helianthus nuttallii Torrey & A. Gray
    0 references
    Helianthus nuttallii Torrey & A. Gray
    Helianthus nuttallii
    Torrey & A. Gray
    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
    Nuttall's sunflower (English)
    common tall sunflower (English)
    clustered sunflower (English)
    hélianthe de Nuttall (French)
    Nuttall’s sunflower (English)
    hélianthe de Nuttall (English)
    Stems (usually yellowbrown or greenish, sometimes glaucous) erect, glabrous, hispid, ± hirsute, or scabrous.
    all or mostly opposite to mostly alternate;
    petioles 0.5–1.5 cm;
    blades light to dark green, 3-nerved (distal to bases) ± lanceolate to ± ovate, 4–20 × 0.8–4 cm, bases cuneate, margins entire or ± serrate (flat), abaxial faces hispid to hispidulous or tomentulose to villous-tomentose, glanddotted.
    Peduncles 1–18 cm.
    Involucres hemispheric, 10–20 mm diam.
    Phyllaries 30–38 (loose, spreading), lanceolate to lanceovate, 8–16 × 1.5–3 mm, (margins ciliate) apices acute to acuminate, abaxial faces usually ± strigose, rarely glabrate, not glanddotted.
    Paleae 8–12 mm, 3-toothed.
    Ray-florets 10–21;
    laminae 20–25 mm (abaxial faces not glanddotted).
    Disc-florets 60+;
    corollas 5–7 mm, lobes yellow;
    anthers dark-brown to black, appendages yellow.
    Cypselae 3–5 mm, glabrate;
    pappi of 2 aristate scales 2.2–4.5 mm plus 0–2 lanceolate scales 0.5–1 mm. 2n = 34 (subspecies unknown).