Cirsium lecontei

Torrey & A. Gray

Fl. N. Amer. 2: 458. 1843.

Common names: Black or Le Conte’s thistle
EndemicConservation concern
Synonyms: Carduus lecontei (Torrey & A. Gray) Pollard
Treatment appears in FNA Volume 19. Treatment on page 114. Mentioned on page 99.

Perennials but sometimes appearing biennial, 35–110 cm; taproots, sometimes with root sprouts. Stems 1–few, erect, distal 1/2 nearly naked, loosely arachnoid; branches 0–5 (–10), stiffly ascending. Leaves: blades linear to oblong or narrowly elliptic, 15–25 × 1–4 cm, coarsely toothed to shallowly pinnatifid, lobes undivided or coarsely few-toothed, main spines 3–6 mm, abaxial faces often ± glabrate, loosely arachnoid when young, adaxial glabrous or sparingly villous with coarse, multicellular trichomes; basal sometimes absent at flowering, petiolate; principal cauline sessile, progressively reduced distally, bases clasping or ± decurrent; distal cauline few, widely separated, bractlike. Heads borne singly or less commonly 2–5 (–10) in open, corymbiform arrays. Peduncles 5–30 cm (elevated above cauline leaves, not subtended by ring of involucrelike bracts). Involucres broadly cylindric to campanulate, 2.5–4 × 1.5–4 cm, loosely arachnoid, ± glabrate. Phyllaries in 6–10 series, imbricate, ovate or lanceolate (outer) to linear-lanceolate (inner), abaxial faces with prominent glutinous ridge, outer and middle tightly appressed, margins spinulose-serrulate, spines ascending, 0.5–2 mm; apices of inner flat, linear acuminate. Corollas pink-purple, 22–45 mm, tubes 10–23 mm, throats 8–14 mm, lobes 7–10 mm; style tips 4–5 mm. Cypselae light-brown, 5–5.75 mm, apical collars paler than body, ca. 0.75 mm; pappi 20–40 mm. 2n = 28, 32.


Phenology: Flowering spring–summer (May–Aug).
Habitat: Sandy pinelands of coastal plain, often in damp soil
Elevation: 0–150 m

Distribution

V19-61-distribution-map.gif

Ala., Fla., La., Miss., N.C., S.C.

Discussion

Of conservation concern.

Cirsium lecontei occurs on the southern coastal plain. R. J. Moore and C. Frankton (1969) suggested that it originated as a derivative of ancient hybridization between the ancestors of C. horridulum and C. nuttallii. They further suggested a relationship between C. lecontei and C. grahamii of Arizona and hypothesized an ancient dispersal from the southeastern coastal plain to the western cordillera. Although such relationships are possible, I have seen little support for them in my examination of these taxa. I think it is more likely that C. lecontei, C. horridulum, and C. nuttallii originated from a common stock, and that the resemblances between C. lecontei and C. grahamii are a result of convergence.

Selected References

None.

Lower Taxa

None.

"fine" is not a number.

... more about "Cirsium lecontei"
middle +  and outer +
arachnoid +  and glabrate +
villous +  and glabrous +
short-tailed +
spineless +  and twisted +
dentate +, entire +  and spine-tipped +
erect +  and spreading +
innermost +
scarious +
0.75 cm7.5 mm <br />0.0075 m <br /> (?) +
corymbiform +  and open +
indeterminate +  and determinate +
David J. Keil +
Torrey & A. Gray +
decurrent +
Asteraceae tribe Cynareae +
compound +  and simple +
15 cm150 mm <br />0.15 m <br /> (25 cm250 mm <br />0.25 m <br />) +
coarsely toothed;shallowly pinnatifid +
1cm;4cm +
10-nerved or 20-nerved +  and rugose +
tawny +  and white +
Black or Le Conte’s thistle +
actinomorphic +
white +  and pink red yellow or purple +
2.2 cm22 mm <br />0.022 m <br /> (4.5 cm45 mm <br />0.045 m <br />) +
compressed +  and ovoid +
fertile +  and bisexual +
Ala. +, Fla. +, La. +, Miss. +, N.C. +  and S.C. +
0–150 m +
gray-canescent +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Sandy pinelands of coastal plain, often in damp soil +
less commonly +  and singly +
indeterminate +
each +  and sessile +
2.5 cm25 mm <br />0.025 m <br /> (4 cm40 mm <br />0.04 m <br />) +
glabrate +  and arachnoid +
broadly cylindric;campanulate +
1.5 cm15 mm <br />0.015 m <br /> (4 cm40 mm <br />0.04 m <br />) +
sessile +  and petiolate +
cauline +  and basal +
bristle-tipped +
few-toothed +  and undivided +
0.3 cm3 mm <br />0.003 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
spinulose-serrulate +
usually lobed +  and dissected +
2-carpellate +
persistent +
2 cm20 mm <br />0.02 m <br /> (4 cm40 mm <br />0.04 m <br />) +
5 cm50 mm <br />0.05 m <br /> (30 cm300 mm <br />0.3 m <br />) +
Flowering spring–summer (May–Aug). +
middle +  and outer +
weakly to strongly +
papillate +  and smooth +
Fl. N. Amer. +
bearing subulate enations +, hairy +  and bristly +
flat;convex +
glutinous +
tawny;white +
setiform +  and plumose +
exalbuminous +
subequal +
Endemic +  and Conservation concern +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
1/2 +, 1 +  and few +
appendaged +  and truncate +
dilated +  and swollen +
enlarged +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Carduus lecontei +
Cirsium lecontei +
species +
cylindric +
expanded +
0.8 cm8 mm <br />0.008 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
bristly-dentate to coarsely +
slender +
1 cm10 mm <br />0.01 m <br /> (2.3 cm23 mm <br />0.023 m <br />) +
perennial +  and biennial +
35 cm350 mm <br />0.35 m <br /> (110 cm1,100 mm <br />1.1 m <br />) +
tree +, vine +, shrub +  and subshrub +