Cirsium eatonii var. peckii

(L. F. Henderson) D. J. Keil

Sida 21: 212. 2004.

Common names: Steens Mountain or ghost thistle
Endemic
Basionym: Cirsium peckii L. F. Henderson Madroño 5: 97. 1939
Treatment appears in FNA Volume 19. Treatment on page 153. Mentioned on page 135, 151.

Stems erect or ascending, stout, 10–150 cm. Leaf faces glabrous or nearly so or abaxial ± villous with septate trichomes. Heads several–many, usually subsessile or short-pedunculate, crowded in erect, spiciform or racemiform arrays, less commonly openly branched. Involucres 2–4 cm, loosely to densely villous with septate trichomes and thinly arachnoid with non-septate trichomes. Phyllaries green; outer with few or no lateral spines; apical spines stout. Corollas pink to purple, 21–25 mm, tubes 6.5–8 mm, throats 8–11.5 mm, lobes 5.5–7 mm. Pappi 17–22 mm. 2n = 34 (as C. peckii).


Phenology: Flowering summer (Jun–Aug).
Habitat: Grasslands, juniper woodlands, grass-sagebrush steppes, subalpine slopes, roadsides
Elevation: 1300–2900 m

Discussion

Variety peckii occurs from Steens Mountain and the Pueblo Mountains of Harney County, Oregon, south to the Black Rock Range and Jackson Mountains of Humboldt County, Nevada. On the lower portion of its distribution along Steens Mountain Loop Road at an elevation of about 1900 m, var. peckii and Cirsium inamoenum grow together and freely hybridize, forming a complex hybrid swarm. Intermediates variably combine the features of the parent taxa, with the habit more openly branched than typical for C. eatonii var. peckii, variably arachnoid tomentose leaves, ± glandular phyllaries, and lavender to pale pink flowers. Variety peckii may range as far south as the West Humboldt Mountains. The type of Cirsium humboldtense Rydberg (Carduus nevadensis Greene) closely resembles some of the hybrids between C. inamoenum and C. eatonii var. peckii.

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 +
racemiform +  and spiciform +
indeterminate +  and determinate +
David J. Keil +
(L. F. Henderson) D. J. Keil +
sessile +, winged-petiolate +  and spiny +
decurrent +
Cirsium peckii +
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 +
Steens Mountain or ghost thistle +
actinomorphic +
pink +  and purple +
2.1 cm21 mm <br />0.021 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
compressed +  and ovoid +
fertile +  and bisexual +
Nev. +  and Oreg. +
1300–2900 m +
gray-canescent +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Grasslands, juniper woodlands, grass-sagebrush steppes, subalpine slopes, roadsides +
branched +, short-pedunculate +  and subsessile +
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 />) +
arachnoid +  and villous +
broadly ovoid;campanulate +
2 cm20 mm <br />0.02 m <br /> (4 cm40 mm <br />0.04 m <br />) +
1.5 cm15 mm <br />0.015 m <br /> (5 cm50 mm <br />0.05 m <br />) +
sessile +  and petiolate +
villous +, 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 +
1.7 cm17 mm <br />0.017 m <br /> (2.2 cm22 mm <br />0.022 m <br />) +
0 cm0 mm <br />0 m <br /> (14 cm140 mm <br />0.14 m <br />) +
Flowering summer (Jun–Aug). +
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 +
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 +
10 cm100 mm <br />0.1 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. peckii +
Cirsium eatonii +
variety +
cylindric +
expanded +
0.8 cm8 mm <br />0.008 m <br /> (1.15 cm11.5 mm <br />0.0115 m <br />) +
bristly-dentate to coarsely +
non-septate +  and septate +
arachnoid-tomentose +
slender +
0.65 cm6.5 mm <br />0.0065 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
10 cm100 mm <br />0.1 m <br /> (150 cm1,500 mm <br />1.5 m <br />) +
tree +, vine +, shrub +  and subshrub +