Cirsium flodmanii

(Rydberg) Arthur

Torreya 12: 34. 1912.

Common names: Prairie or Flodman’s thistle chardon de Flodman
Endemic
Basionym: Carduus flodmanii Rydberg Mem. N. Y. Bot. Gard. 1: 451. 1900
Synonyms: Cirsium oblanceolatum (Rydberg) K. Schumann
Treatment appears in FNA Volume 19. Treatment on page 120. Mentioned on page 98, 100, 101, 106, 107, 113, 121.

Perennials 30–140 cm; horizontal runner roots that produce root sprouts. Stems 1–several, erect, gray or white-tomentose; branches 0–few, ascending. Leaves: blades oblong-oblanceolate to narrowly elliptic, 4–40 × 1–10 cm, bases usually not decurrent, finely spiny-toothed and undivided to coarsely toothed or deeply pinnatifid, lobes broadly triangular to linear-lanceolate, often revolute-margined, main spines 1–7 mm, abaxial faces white-tomentose, adaxial faces green, thinly tomentose, ± glabrate; basal usually absent or withered at flowering, winged petiolate; principal cauline proximally winged-petiolate, distally sessile, well distributed, gradually reduced, bases usually not decurrent; distal cauline well developed. Heads erect, borne singly and terminal on main-stem and branches, or few in corymbiform arrays from distal axils (not subtended by ring of spiny-margined bracts). Peduncles 0–5 cm (elevated above distal leaves). Involucres ovoid to broadly campanulate, 2–3.5 × 2.5–3.5 cm, thinly arachnoid. Phyllaries in 7–12 series, strongly imbricate, greenish with subapical darker central zone, ovate or lanceolate (outer) to linear (inner), abaxial faces with prominent glutinous ridge; outer and middle entire, bodies appressed, entire, acute, spines abruptly spreading, slender, 2–4 mm; apices of inner spreading, flexuous, narrow, flattened, finely serrulate, ± scabrous. Corollas purple (white), 23–36 mm, tubes 12–15 mm, throats 6–8.5 mm, lobes 5–9 mm; style tips 4–7 mm. Cypselae light-brown, 3–5 mm, apical collars stramineous, 0.5–1 mm; pappi (white or tawny) 20–30 mm. 2n = 22, 24.


Phenology: Flowering summer (Jun–Sep).
Habitat: Tallgrass, mixedgrass, shortgrass prairies, meadows, pastures, often in damp soil
Elevation: 100–2400 m

Distribution

V19-74-distribution-map.gif

Alta., Man., Ont., Que., Sask., Colo., Ill., Iowa, Kans., Mich., Minn., Mont., Nebr., N.Dak., S.Dak., Wis., Wyo.

Discussion

Cirsium flodmanii ranges from Saskatchewan and Alberta south through the northern Great Plains and intermountain valleys of Montana and Wyoming to northeastern Colorado and east through the prairies to Minnesota and Iowa, and in widely scattered locations eastward to northern Illinois, southern Wisconsin, southern Ontario, and southern Quebec. It is known to hybridize with C. muticum and C. undulatum. Hybrids between C. flodmanii and C. undulatum are highly sterile with numerous meiotic irregularities (S. Dabydeen 1987).

Selected References

None.

Lower Taxa

None.

"fine" is not a number.

... more about "Cirsium flodmanii"
white-tomentose +
glabrate +  and tomentose +
short-tailed +
spineless +  and twisted +
dentate +, entire +  and spine-tipped +
erect +  and spreading +
innermost +
scarious +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
indeterminate +  and determinate +
David J. Keil +
(Rydberg) Arthur +
petiolate +  and winged +
decurrent +, undivided +  and coarsely toothed or deeply pinnatifid +
Carduus flodmanii +
compound +  and simple +
4 cm40 mm <br />0.04 m <br /> (40 cm400 mm <br />0.4 m <br />) +
oblong-oblanceolate;narrowly elliptic +
1cm;10cm +
10-nerved or 20-nerved +  and rugose +
tawny +  and white +
Prairie or Flodman’s thistle +  and chardon de Flodman +
actinomorphic +
white +  and pink red yellow or purple +
2.3 cm23 mm <br />0.023 m <br /> (3.6 cm36 mm <br />0.036 m <br />) +
compressed +  and ovoid +
fertile +  and bisexual +
Alta. +, Man. +, Ont. +, Que. +, Sask. +, Colo. +, Ill. +, Iowa +, Kans. +, Mich. +, Minn. +, Mont. +, Nebr. +, N.Dak. +, S.Dak. +, Wis. +  and Wyo. +
100–2400 m +
gray-canescent +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Tallgrass, mixedgrass, shortgrass prairies, meadows, pastures, often in damp soil +
indeterminate +
each +  and sessile +
2 cm20 mm <br />0.02 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
ovoid;broadly campanulate +
2.5 cm25 mm <br />0.025 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
sessile +  and petiolate +
cauline +  and basal +
revolute-margined +
broadly triangular +  and linear-lanceolate +
0.1 cm1 mm <br />0.001 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
entire +  and dentate +
usually lobed +  and dissected +
2-carpellate +
persistent +
2 cm20 mm <br />0.02 m <br /> (3 cm30 mm <br />0.03 m <br />) +
0 cm0 mm <br />0 m <br /> (5 cm50 mm <br />0.05 m <br />) +
Flowering summer (Jun–Sep). +
middle +  and outer +
weakly to strongly +
papillate +  and smooth +
sessile +  and winged-petiolate +
bearing subulate enations +, hairy +  and bristly +
flat;convex +
glutinous +
tawny;white +
setiform +  and plumose +
exalbuminous +
subequal +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
spiny-winged +, simple +  and branched +
1 +  and several +
appendaged +  and truncate +
dilated +  and swollen +
enlarged +
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
Cirsium oblanceolatum +
Cirsium flodmanii +
species +
cylindric +
expanded +
0.6 cm6 mm <br />0.006 m <br /> (0.85 cm8.5 mm <br />0.0085 m <br />) +
bristly-dentate to coarsely +
slender +
1.2 cm12 mm <br />0.012 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
30 cm300 mm <br />0.3 m <br /> (140 cm1,400 mm <br />1.4 m <br />) +
tree +, vine +, shrub +  and subshrub +