Cirsium nuttallii

de Candolle in A. P. de Candolle and A. L. P. P. de Candolle

in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 6: 651. 1838.

Common names: Nuttall’s thistle
Endemic
Basionym: Carduus glaber Nuttall Gen. N. Amer. Pl. 2: 129. 1818,
Synonyms: Carduus nuttallii (de Candolle) Pollard
Treatment appears in FNA Volume 19. Treatment on page 119. Mentioned on page 98, 114.

Biennials, 20–350 cm; taprooted. Stems usually single, erect, glabrous or villous with septate trichomes; branches few–many, ascending. Leaves: blades narrowly to broadly elliptic, (10–) 15–60 × (2–) 5–15 cm, thin, ± flexible, deeply pinnatifid, lobes narrow, spreading, coarsely dentate or lobed, main spines 2–5 mm, abaxial faces thinly tomentose but often wholly glabrate in age, adaxial glabrous or sparsely villous with septate trichomes; basal often absent at flowering, petioles slender, winged, bases tapered; principal cauline becoming sessile and gradually reduced distally, bases spiny-lobed, sometimes decurrent; distal reduced to linear bracts. Heads few–many, in open corymbiform or paniculiform arrays. Peduncles 1–15 cm, essentially naked (not overtopped by crowded distal leaves). Involucres hemispheric to campanulate, 1.5–2.5 × 1–2.5 cm, thinly arachnoid or glabrate. Phyllaries in 6–10 series, strongly imbricate, green or brownish, ovate or elliptic (outer) to linear-lanceolate (inner), abaxial faces with narrow glutinous ridge; outer and middle appressed, bodies entire, spines abruptly spreading, slender, 1–2 (–3) mm; apices of inner often flexuous, flat, attenuate. Corollas white to pink, lavender, or purple, 17–25 mm, tubes 5–11 mm, throats 4–7 mm (noticeably wider than tubes), lobes 5–7 mm; style tips 3–4.5 mm. Cypselae dark-brown, 3–4 mm, apical collars stramineous, 0.5 mm; pappi 17–21 mm (longer bristles shorter than corollas). 2n = 24, 26, 28.


Phenology: Flowering summer (Jun–Aug).
Habitat: Roadsides, ditches, woodlands, usually in damp soil
Elevation: 0–100 m

Distribution

V19-72-distribution-map.gif

Ala., Fla., Ga., La., Miss., N.C., S.C., Tex., Va.

Discussion

Cirsium nuttallii occurs on the southern coastal plain from southeastern Virginia to southern Florida and west to eastern Louisiana.

Selected References

None.

Lower Taxa

None.

"fine" is not a number.

... more about "Cirsium nuttallii"
28 +, 26 +  and 24 +
glabrate +  and tomentose +
villous +  and glabrous +
short-tailed +
spineless +  and twisted +
dentate +, entire +  and spine-tipped +
erect +  and spreading +
innermost +
scarious +
0.5 cm5 mm <br />0.005 m <br /> (?) +
paniculiform +, corymbiform +  and open +
indeterminate +  and determinate +
David J. Keil +
de Candolle in A. P. de Candolle and A. L. P. P. de Candolle +
decurrent +, spiny-lobed +  and tapered +
Carduus glaber +
compound +  and simple +
10 cm100 mm <br />0.1 m <br /> (15 cm150 mm <br />0.15 m <br />) +
2 cm20 mm <br />0.02 m <br /> (5 cm50 mm <br />0.05 m <br />) +
15 cm150 mm <br />0.15 m <br /> (60 cm600 mm <br />0.6 m <br />) +
pinnatifid +
thin;5cm;15cm +
10-nerved or 20-nerved +  and rugose +
tawny +  and white +
Nuttall’s thistle +
actinomorphic +
white +  and pink lavender or purple +
1.7 cm17 mm <br />0.017 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
compressed +  and ovoid +
fertile +  and bisexual +
Ala. +, Fla. +, Ga. +, La. +, Miss. +, N.C. +, S.C. +, Tex. +  and Va. +
0–100 m +
gray-canescent +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Roadsides, ditches, woodlands, usually in damp soil +
indeterminate +
each +  and sessile +
1.5 cm15 mm <br />0.015 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
glabrate +  and arachnoid +
hemispheric;campanulate +
1 cm10 mm <br />0.01 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
sessile +  and petiolate +
cauline +  and basal +
bristle-tipped +
lobed +  and dentate +
0.2 cm2 mm <br />0.002 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
entire +  and dentate +
usually lobed +  and dissected +
2-carpellate +
persistent +
1.7 cm17 mm <br />0.017 m <br /> (2.1 cm21 mm <br />0.021 m <br />) +
1 cm10 mm <br />0.01 m <br /> (15 cm150 mm <br />0.15 m <br />) +
Flowering summer (Jun–Aug). +
middle +  and outer +
weakly to strongly +
papillate +  and smooth +
in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. +
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 /> (0.3 cm3 mm <br />0.003 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
spiny-winged +, simple +  and branched +
appendaged +  and truncate +
dilated +  and swollen +
enlarged +
0.3 cm3 mm <br />0.003 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
Carduus nuttallii +
Cirsium nuttallii +
species +
cylindric +
expanded +
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
bristly-dentate to coarsely +
slender +
0.5 cm5 mm <br />0.005 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
20 cm200 mm <br />0.2 m <br /> (350 cm3,500 mm <br />3.5 m <br />) +
tree +, vine +, shrub +  and subshrub +