Cirsium muticum Michx.

Swamp thistle (en)

Species

Angiosperms > Asterales > Asteraceae > Cirsium

Characteristics

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.
More
Coarse biennial with several stout roots, 5–20 dm, branching and many-headed when well developed, villous or arachnoid when young, later glabrescent; lvs deeply pinnatifid into lanceolate or oblong, entire, lobed, or dentate segments, only weakly spiny, often very large, to 5.5 × 2 dm, sometimes thinly tomentose beneath, otherwise arachnoid-hirsute to subglabrous; invol 2–3.5 cm, multiseriate, its bracts ± tomentose, especially marginally, generally with a glutinous dorsal ridge, innocuous or with a vestigial spinule up to ca 0.5 mm, the inner commonly with loose, crisped tips, but not expanded; fls purple, pink, or deep lavender, rarely white; achenes 5 mm; 2n=20. Swamps and bogs, wet meadows, and moist woods and thickets; Nf. to Sask., s. to Del. and Mo. and in the mts. to N.C. and Tenn., and irregularly to Fla. and Tex. July–Oct.
Life form biennial
Growth form herb
Growth support free-standing
Foliage retention deciduous
Sexuality hermaphrodite
Pollination -
Spread -
Mature width (meter) -
Mature height (meter) 0.3 - 2.3
Root system tap-root
Rooting depth (meter) -
Root diameter (meter) -
Flower color
Blooming months
JanFebMar
AprMayJun
JulAugSep
OctNovDec
Fruit color -
Fruiting months -
Nitrogen fixer -
Photosynthetic pathway -

Environment

Light 7-9
Soil humidity 5-7
Soil texture 3-4
Soil acidity -
Soil nutriment -
Hardiness (USDA) 4-9

Usage

Uses -
Edible -
Therapeutic use -
Human toxicity -
Animal toxicity -

Cultivation

Mode -
Germination duration (days) 15 - 18
Germination temperacture (C°) 21 - 23
Germination luminosity -
Germination treatment -
Minimum temperature (C°) -
Optimum temperature (C°) -
Size -
Vigor -
Productivity -

Images

Habit

Cirsium muticum habit picture by steven Levenberg (cc-by-sa)

Leaf

Cirsium muticum leaf picture by Elijah Jay (cc-by-sa)
Cirsium muticum leaf picture by steven Levenberg (cc-by-sa)
Cirsium muticum leaf picture by Bingley Joshua (cc-by-sa)

Flower

Cirsium muticum flower picture by Elijah Jay (cc-by-sa)
Cirsium muticum flower picture by Elijah Jay (cc-by-sa)
Cirsium muticum flower picture by sherry gray (cc-by-sa)

Distribution

Cirsium muticum world distribution map, present in Canada, France, Saint Pierre and Miquelon, and United States of America

Identifiers

LSID urn:lsid:ipni.org:names:195721-1
WFO ID wfo-0000006887
COL ID VJ7K
BDTFX ID -
INPN ID 761892
Wikipedia (EN) Link
Wikipedia (FR)

Synonyms

Cirsium muticum f. muticum Cnicus muticus Cirsium bigelowii Cnicus muticus Carduus muticus Carduus muticus var. muticus Cnicus muticus var. muticus Cirsium muticum var. monticola Cirsium muticum var. muticum Cirsium muticum var. subpinnatifidum Cnicus glaber Cirsium muticum