Cirsium canescens Nuttall (Q3024)
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Cirsium canescens is a taxon with the rank species within the genus Cirsium
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Cirsium canescens Nuttall
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Cirsium canescens is a taxon with the rank species within the genus Cirsium
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Statements
taxon/id/Cirsium canescens Nuttall
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Cirsium canescens Nuttall
Cirsium canescens
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-SK
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Harms, V.L. 2006. Annotated catalogue of Saskatchewan vascular plants. http://www.biodiversity.sk.ca/Docs/AnnotatedCatalogueSKVascPlants2006.pdf
US-CA
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US-CO
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US-MO
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US-MT
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US-NE
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US-NV
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US-SD
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US-WY
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1100–3800 m
1,100 meter
3,800 meter
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Stems usually 1, erect, ± densely gray-tomentose with fine, non-septate trichomes;
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branches 0 or few, usually above middle in distal 1/2, ascending.
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Leaves: blades oblong to elliptic or obovate, 10–25 (–40) × 2–6 (–12) cm, coarsely dentate or shallowly lobed to deeply pinnatifid, lobes well separated, triangular to linear or oblong, often revolute-margined, ascending to spreading, spinulose to spinose-dentate, main spines 2–3 (–10) mm, faces gray-tomentose, more densely abaxially, sometimes glabrate adaxially;
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basal usually present at flowering, winged-petiolate;
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principal cauline progressively reduced distally, bases decurrent as spiny wings 1–5 cm, sometimes with expanded auricles;
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distal cauline usually much reduced, less lobed.
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Heads 1–10+, terminal on branches or in distal axils, in openly corymbiform to racemiform arrays.
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Peduncles 0–10 cm.
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Involucres hemispheric to broadly campanulate, usually truncate or indented at base, 3–4 × 2.5–4 cm in first-formed heads, often smaller (1.5–2 cm) in later ones, loosely arachnoid on phyllary margins or glabrate.
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Phyllaries in 6–9 series, imbricate, ovatelanceolate (outer) to linear-lanceolate (inner), abaxial faces with prominent glutinous ridge;
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bodies of outer and middle appressed, acute, spines ascending to spreading, 2–4 (–8) mm;
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apices of inner expanded and flat, often twisted, scabrid-margined, and erose, spineless.
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Corollas dull white or lavender-tinged, 20–35 mm, tubes 10–17 mm, throats 6–11 mm, lobes 4–9 mm;
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style tips 5–8 mm.
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Cypselae light-brown, 5–7 mm, sometimes with darker streaks, apical collar very narrow, lighter colored;
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gray-tomentose
more or less densely
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shallowly lobed
deeply pinnatifid
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glabrate
densely abaxially; abaxially; sometimes; adaxially
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reduced
progressively; distally
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hemispheric
broadly campanulate usually truncate or indented
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hemispheric
broadly campanulate usually truncate or indented
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ovatelanceolate
linear-lanceolate
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usually noticeably shorter
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