Cirsium hookerianum Nuttall (Q3017)
Cirsium hookerianum is a taxon with the rank species within the genus Cirsium
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Cirsium hookerianum Nuttall
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Cirsium hookerianum is a taxon with the rank species within the genus Cirsium
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Statements
taxon/id/Cirsium hookerianum Nuttall
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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
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CA-BC
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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/
CA-AB
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Moss, E.H. 1983. Flora of Alberta. 2nd edition, revised by J.G. Packer. University of Toronto Press, Toronto. 687 pp.
CA-AB
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CA-BC
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US-ID
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US-MT
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US-WA
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US-WY
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600–2900 m
600 meter
2,900 meter
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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;
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branches on distal stems 0–many, short, ascending.
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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;
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basal often present at flowering, spiny winged-petiolate or sessile;
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principal cauline well distributed, proximally winged-petiolate, distally sessile, gradually reduced, bases sometimes short-decurrent;
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distal ± reduced, often narrower than proximal, sometimes with non-pigmented bases, sometimes pectinately spiny.
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Heads 1–many, borne singly or crowded in spiciform, racemiform, subcapitate, or sometimes more openly branched corymbiform arrays.
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Peduncles 0–8+ cm.
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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.
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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;
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apices of inner flexuous, sometimes expanded and erose.
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Corollas white, ochroleucous, or occasionally pink, 20–28 mm, tubes 10–13 mm, throats 6.5–9 mm, lobes 5–7 mm;
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style tips 3–5.5 mm.
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Cypselae dark-brown, 5–6.5 mm, apical collars not differentiated;
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pappi 18–22 mm. 2n = 34.
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subentire
coarsely dentate or deeply pinnatifid
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usually more or less densely
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