Cirsium hookerianum Nuttall (Q3017)

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

    Statements

    taxon/id/Cirsium hookerianum Nuttall
    0 references
    Cirsium hookerianum Nuttall
    Cirsium hookerianum
    Nuttall
    FNA Editorial Committee. 2006. Flora of North America north of Mexico. Volume 19: Magnoliophyta: Asteridae, part 6: Asteraceae, part 1. Oxford University Press, New York.
    accepted
    chardon de Hooker (French)
    Hooker's thistle (English)
    white thistle (English)
    Hooker’s or white thistle (English)
    1 reference
    Klinkenberg, B. (ed.). 2010+. E-Flora BC: Electronic Atlas of the Plants of British Columbia. Lab. for Advanced Spatial Analysis, Department of Geography, University of British Columbia, Vancouver, B.C. http://www.eflora.bc.ca http://www.eflora.bc.ca/
    1 reference
    Moss, E.H. 1983. Flora of Alberta. 2nd edition, revised by J.G. Packer. University of Toronto Press, Toronto. 687 pp.
    Flowering summer (Jun–Sep).
    moist soil
    grasslands
    aspen parkland
    forest edges
    openings
    subalpine
    alpine meadows
    Stems usually 1 and erect, less commonly several and ascending, simple to sparingly short-branched in distal 1/2, variably villous with jointed trichomes, and/or finely arachnoid, or ± glabrate;
    branches on distal stems 0–many, short, ascending.
    Leaves: blades linear-oblong to elliptic, 5–25 × 1–8 cm, subentire to coarsely dentate or deeply pinnatifid, lobes lance-oblong to broadly triangular, spinulose to spiny-dentate or shallowly lobed, main spines 2–10 mm, abaxial faces usually ± densely gray or white-tomentose with felted arachnoid trichomes, ± villous to tomentose along major veins with septate trichomes, sometimes glabrous or glabrate, adaxial ± green, glabrous to thinly arachnoid, often ± villous or tomentose with septate trichomes;
    basal often present at flowering, spiny winged-petiolate or sessile;
    principal cauline well distributed, proximally winged-petiolate, distally sessile, gradually reduced, bases sometimes short-decurrent;
    distal ± reduced, often narrower than proximal, sometimes with non-pigmented bases, sometimes pectinately spiny.
    Heads 1–many, borne singly or crowded in spiciform, racemiform, subcapitate, or sometimes more openly branched corymbiform arrays.
    Peduncles 0–8+ cm.
    Involucres (green or often purplish), broadly ovoid, 2–3.3 × 1.5–4 cm, loosely to densely villous with septate trichomes to tomentose and/or arachnoid.
    Phyllaries in 4–8 series, imbricate to subequal, bases short-appressed, entire, abaxial faces with or without narrow glutinous ridge, apices stiffly spreading to ascending, linear, long, plane, spines straight, slender, 3–5 mm;
    apices of inner flexuous, sometimes expanded and erose.
    Corollas white, ochroleucous, or occasionally pink, 20–28 mm, tubes 10–13 mm, throats 6.5–9 mm, lobes 5–7 mm;
    style tips 3–5.5 mm.
    Cypselae dark-brown, 5–6.5 mm, apical collars not differentiated;
    pappi 18–22 mm. 2n = 34.