Cirsium brevistylum Cronquist (Q3011)
Cirsium brevistylum is a taxon with the rank species within the genus Cirsium
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Cirsium brevistylum Cronquist
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Cirsium brevistylum is a taxon with the rank species within the genus Cirsium
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Statements
taxon/id/Cirsium brevistylum Cronquist
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Cirsium brevistylum Cronquist
Cirsium brevistylum
Cronquist
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/
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US-CA
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Stems usually 1, erect, simple or branched in distal 1/2, loosely to densely villous or viscid-pilose with jointed trichomes, often arachnoid below heads;
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branches 0–many, ascending.
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Leaves: blades oblong to elliptic or oblanceolate, 15–35 × 2–10 cm, flat to ± undulate, coarsely dentate to shallowly pinnatifid, lobes broadly triangular, spinulose to spiny-dentate or shallowly lobed, main spines slender, 3–7 mm, abaxial faces thinly gray-tomentose, villous along major veins, sometimes glabrescent, adaxial sparsely villous or viscid-pilose along midveins with jointed trichomes;
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basal often absent at flowering, spiny winged-petiolate;
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principal cauline well distributed, gradually reduced, proximal winged-petiolate, mid and distal sessile, bases clasping or short-decurrent;
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distal moderately to strongly reduced, often spinier than the proximal.
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Heads 1–many, ± erect, usually crowded in subcapitate to tight corymbiform arrays, closely subtended by clustered ± leafy bracts.
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Peduncles 0–1 (–30) cm.
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Involucres hemispheric to campanulate, 2.5–3.5 cm, 2.5–4 cm diam., loosely to densely arachnoid, phyllaries connected by long septate or non-septate trichomes.
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Phyllaries radiating in 5–10 series, subequal, green, linear-acicular, outermost margins sometimes spiny-fringed, otherwise all entire or minutely serrulate, abaxial faces without glutinous ridge;
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outer and mid-bases short-appressed, apices stiffly radiating to ascending, long, very narrow, spines straight, slender, 3–5 m;
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apices of inner straight, flat.
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Corollas white to pink or purple, very slender, 20–25 mm, tubes 10–17 mm, throats 4–5 mm, lobes filiform with knoblike tips, 3–5 mm;
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style tips 2–4 mm, included or exserted (only 1–2 mm beyond corolla lobes).
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Cypselae brown, 3–4.5 mm, apical collars stramineous, 0.2 mm;
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pappi 10–22 mm. 2n = 34.
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villous
loosely to densely; densely
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elliptic or oblanceolate
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more or less undulate coarsely dentate
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more or less undulate coarsely dentate
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reduced
moderately to strongly
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