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Cirsium muticum is very widely distributed across the eastern half of North America from the prairies of southeastern Saskatchewan across southern Canada to Newfoundland and south in the United States from North Dakota and Maine to southeastern Texas and northern Florida. It is more common in the northern half of this range and extends from the coastal plain to the Appalachian highlands. The widely scattered populations in coastal lowlands in the southern United States may be relicts of the glacial distribution of the species.
Cirsium muticum is known to hybridize with C. discolor (discussed thereunder) and C. flodmanii. Draining and modification of wetlands have affected populations of C. muticum in some areas.
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Description
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Biennials, 30–230 cm; taproots fleshy. Stems single, erect, villous with septate trichomes or glabrate, distally sometimes thinly tomentose; branches few–many, ascending. Leaves ovate to broadly elliptic or obovate, 15–55 × 4–20 cm, deeply pinnatifid, to 7/8 to midribs, lobes linear to lanceolate, acute to acuminate, irregularly few toothed or lobed, main spines 2–3 mm, abaxial faces thinly tomentose or glabrate, villous with septate trichomes on the veins, adaxial faces thinly pilose; basal usually absent at flowering, petioles spiny-winged, bases tapered; principal cauline petiolate or sessile, gradually reduced distally, bases sometimes ± clasping, not decurrent; distal cauline bractlike with narrowly linear lobes, often spinier than the proximal. Heads 1–many in ± open corymbiform or paniculiform arrays. Peduncles 0–15 cm (sometimes overtopped by distal cauline leaves, not subtended by involucre-like ring of bracts. . Involucres ovoid to broadly cylindric or campanulate, 1.7–3 × 1–3 cm, arachnoid. Phyllaries in 8–12 series, strongly imbricate, dull green with darker subapical patch, ovate (outer) to linear-lanceolate (inner), abaxial faces with narrow glutinous ridge, outer and middle appressed, bodies minutely spinulose, apices obtuse to acute, spines erect (sometimes appearing as spreading in dry specimens), 0–0.5 mm; apices of inner phyllaries straight or ± flexuous, flattened. Corollas lavender or purple (white), 16–32 mm, tubes 7–15 mm, throats 4.5–10 mm (noticeably wider than tubes. , lobes 4–8 mm; style tips 3.5–5 mm. Cypselae dark brown, 4.5–5.5 mm, apical collars yellow, 0.3 mm; pappi 12–20 mm. 2n = 20, 21, 22, 23, 30.
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Synonym
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Carduus muticus (Michaux) Persoon; Cirsium muticum var. monticola (Fernald) Fernald
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Cirsium muticum
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Inglês
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fornecido por wikipedia EN
Cirsium muticum, also known as swamp thistle, marsh thistle, dunce-nettle, or horsetops, is a North American species of plants in the family Asteraceae, native to central and eastern Canada and the central and eastern United States.
Description
Cirsium muticum is a biennial plant that reaches a height of 180 centimetres (71 in). Its taproot is fleshy and its stem is ridged with hairs toward the base.[2] The leaves are alternate in position, pinnately lobed, and ovate in shape. The leaf lobes are often asymmetrical and forked irregularly with the angles containing fine trichomes (multicellular hairs). The leaves become progressively smaller towards the inflorescence; there are often a few trichomes on the underside.[2] The peduncles are 0–15 cm (0.0–5.9 in), each with an inflorescence made up of many tiny florets; the involucre has cobwebby white hairs, and it is often slightly sticky. The purple florets can be up to 27 mm (1.1 in) long.[2][3]
Taxonomy and naming
Cirsium muticum was described by the French naturalist André Michaux in 1803. It is one of many species in the thistle genus Cirsium. The epithet muticum, meaning blunt, refers to its phyllaries.
Distribution and habitat
Cirsium muticum has been found across every province of Canada from Labrador and Newfoundland to Saskatchewan. In the United States, it grows primarily in the Northeast, the Great Lakes region, and the Appalachians, with isolated populations scattered across the South from Texas to the Carolinas.[4][5][6]
Cirsium muticum is found mostly in alkaline swamps, wetlands, marshes and low forests but some races have been known to grow in wet alpine climates.[2]
Ecology
Cirsium muticum is as host for some species of butterflies and moths, including the swamp metalmark butterfly (Calephelis muticum), a species that is currently undergoing risk assessment in the United States. The butterfly lays its eggs on the swamp thistle, and when the eggs hatch, the flowers are the only food source for the caterpillars.[7] It is also a larval host to the painted lady butterfly, and songbirds eat its seeds.[8] Species that grow with it include Aster umbellatus (flat-topped white aster), Solidago patula (rough-leaved goldenrod), Lysimachia quadrifolia (prairie loosestrife), and Gentiana procera (smaller fringed gentian).[7]
Human importance
Swamp thistles can be used to make decorative arrangements. They are often planted in gardens because they are seen as more manageable than other thistles, while still potentially having some anti-herbivory properties.[9]
Conservation
The plant is not endangered in Canada or the U.S. but it is threatened in the state of Arkansas,[4] and vulnerable in the province of Saskatchewan.[10] Cirsium muticum is at risk primarily because it is a wetland plant, and North American wetlands have been much reduced in extent over the last two centuries.
References
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^ The Plant List, Cirsium muticum Michx.
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^ a b c d C. Frankton & J. Moore (1963). "Cytotaxonomy of Cirsium muticum, Cirsium discolour, and Cirsium altissimum". Canadian Journal of Botany. 41: 73–84. doi:10.1139/b63-008.
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^ Flora of North America, Swamp thistle, dunce-nettle, horsetops, chardon mutique, Cirsium muticum Michaux
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^ a b "PLANTS Profile for Cirsium muticum Michx. (swamp thistle)". United States Department of Agriculture. 2011. Retrieved October 20, 2011.
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^ Biota of North America Program 2014 county distribution map
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^ Biota of North America Program 2014 state-level distribution map
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^ a b John A. Shuey, John V. Calhoun & David C. Iftner (1987). "Butterflies that are Endangered, Threatened, and of Special Concern in Ohio". Ohio Journal of Science. 87 (4): 98–106. hdl:1811/23205.
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^ The Xerces Society (2016), Gardening for Butterflies: How You Can Attract and Protect Beautiful, Beneficial Insects, Timber Press.
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^ H. Hamilton (2010). "Cirsium muticum Michx., Compositae". Archived from the original on November 5, 2010. Retrieved December 10, 2011.
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^ "Species: Cirsium muticum". University of Saskatchewan. 2008-05-30. Retrieved December 10, 2011.
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Cirsium muticum: Brief Summary
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fornecido por wikipedia EN
Cirsium muticum, also known as swamp thistle, marsh thistle, dunce-nettle, or horsetops, is a North American species of plants in the family Asteraceae, native to central and eastern Canada and the central and eastern United States.
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Cirsium muticum
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Vietnamita
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Cirsium muticum: Brief Summary
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Vietnamita
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Cirsium muticum là một loài thực vật có hoa trong họ Cúc. Loài này được Michx. mô tả khoa học đầu tiên năm 1803.
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