Cirsium eatonii var. clokeyi

(S. F. Blake) D. J. Keil

Sida 21: 212. 2004.

Common names: Clokey or Spring Mountains or white-spine thistle
EndemicConservation concern
Basionym: Cirsium clokeyi S. F. Blake Proc. Biol. Soc. Wash. 51: 8. 1938
Treatment appears in FNA Volume 19. Treatment on page 151. Mentioned on page 144.

Stems erect or ascending, stout, 40–150 cm. Leaf faces glabrous or nearly so. Heads usually short-pedunculate in erect, racemiform arrays or sometimes long-pedunculate in openly corymbiform arrays. Involucres 3–5 cm, glabrous or thinly arachnoid tomentose, individual phyllaries evident. Phyllaries green or purplish-tinged; outer pectinately spiny 1/2 their length with many lateral spines; apical spines stout. Corollas purple, 24–33 mm, tubes 3.5–7 mm, throats 11–14 mm, lobes 8–12.5 mm. Pappi 16–18 mm. 2n = 34 (as C. clokeyi).


Phenology: Flowering summer (Jul–Sep).
Habitat: Gravelly slopes, ravines, montane coniferous forests, subalpine forests, alpine scree
Elevation: 2300–3500 m

Discussion

Of conservation concern.

Variety clokeyi is endemic to the Spring Range of Clark County. Its range overlaps that of Cirsium arizonicum var. tenuisectum but no hybrids between the two are known.

Selected References

None.

Lower Taxa

None.

"fine" is not a number.

villous +  and glabrous +
villous +, glabrous +  and arachnoid-tomentose +
short-tailed +
spineless +  and twisted +
dentate +, entire +  and spine-tipped +
usually stiffly ascending +  and spreading +
innermost +
scarious +
not differentiated +
indeterminate +  and determinate +
David J. Keil +
(S. F. Blake) D. J. Keil +
sessile +, winged-petiolate +  and spiny +
decurrent +
Cirsium clokeyi +
compound +  and simple +
10 cm100 mm <br />0.1 m <br /> (30 cm300 mm <br />0.3 m <br />) +
1cm;5cm +
10-nerved or 20-nerved +  and rugose +
spiny-fringed +
tawny +  and white +
? (?) +  and ? (?) +
Clokey or Spring Mountains or white-spine thistle +
actinomorphic +
yellow +  and lavender pink or purple +
2.4 cm24 mm <br />0.024 m <br /> (3.3 cm33 mm <br />0.033 m <br />) +
compressed +  and ovoid +
fertile +  and bisexual +
2300–3500 m +
gray-canescent +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Gravelly slopes, ravines, montane coniferous forests, subalpine forests, alpine scree +
long-pedunculate +  and short-pedunculate +
indeterminate +
nodding +  and erect +
each +  and sessile +
suffused with dark purple +  and green +
2 cm20 mm <br />0.02 m <br /> (5 cm50 mm <br />0.05 m <br />) +
tomentose +, arachnoid +  and glabrous +
broadly ovoid;campanulate +
3 cm30 mm <br />0.03 m <br /> (5 cm50 mm <br />0.05 m <br />) +
1.5 cm15 mm <br />0.015 m <br /> (5 cm50 mm <br />0.05 m <br />) +
sessile +  and petiolate +
nearly +  and glabrous +
cauline +  and basal +
bristle-tipped +
deltate +, usually narrowly triangular +  and more or less linear +
0.2 cm2 mm <br />0.002 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
3-lobed +, lance-oblong +  and broadly triangular +
2-carpellate +
persistent +
1.6 cm16 mm <br />0.016 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
0 cm0 mm <br />0 m <br /> (14 cm140 mm <br />0.14 m <br />) +
Flowering summer (Jul–Sep). +
spine-tipped +  and plane +
middle +  and outer +
papillate +  and smooth +
sessile +  and winged-petiolate +
bearing subulate enations +, hairy +  and bristly +
flat;convex +
glutinous +
tawny;white +
setiform +  and plumose +
exalbuminous +
subequal +
Endemic +  and Conservation concern +
0.7 cm7 mm <br />0.007 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
branched +, simple +  and sparingly branched +
ascending +  and erect +
1 +  and several +
40 cm400 mm <br />0.4 m <br /> (150 cm1,500 mm <br />1.5 m <br />) +
appendaged +  and truncate +
dilated +  and swollen +
enlarged +
0.3 cm3 mm <br />0.003 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
Compositae +
Cirsium eatonii var. clokeyi +
Cirsium eatonii +
variety +
cylindric +
expanded +
1.1 cm11 mm <br />0.011 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
bristly-dentate to coarsely +
non-septate +  and septate +
arachnoid-tomentose +
slender +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
10 cm100 mm <br />0.1 m <br /> (150 cm1,500 mm <br />1.5 m <br />) +
tree +, vine +, shrub +  and subshrub +