Cirsium ciliolatum

(L. F. Henderson) J. T. Howell

Leafl. W. Bot. 9: 9. 1959.

Common names: Ashland thistle
EndemicConservation concern
Basionym: Cirsium undulatum var. ciliolatum L. F. Henderson Bull. Torrey Bot. Club 27: 348. 1900 (as Circium)
Synonyms: Cirsium howellii Petrak
Treatment appears in FNA Volume 19. Treatment on page 121. Mentioned on page 105, 108.

Perennials 60–200 cm, arachnoid, tomentose; runner roots producing adventitious-buds. Stems 1–several, erect, thinly arachnoid to densely white-tomentose; branches 0–few, ascending. Leaves: blades oblongelliptic, 10–30 × 3–12 cm, margins finely spiny-toothed and otherwise undivided to coarsely dentate, shallowly lobed, or deeply laciniate-pinnatifid, lobes broadly triangular to linear-lanceolate, main spines 1–6 mm, abaxial white-tomentose, adaxial faces ± green, thinly to densely arachnoid-tomentose; basal often present at flowering, winged petiolate; principal cauline well distributed, proximally winged-petiolate, distally sessile, gradually reduced, bases auriculate-clasping or short-decurrent as spiny wings; distal cauline few, reduced to linear bracts. Heads borne singly and terminal on main-stem and branches, or few in corymbiform arrays. Peduncles 0–15 cm. Involucres ovoid to hemispheric, 1.5–2.3 × 1.5–3 cm, thinly arachnoid, ± glabrate. Phyllaries in 5–7 series, strongly imbricate, greenish with subapical darker central zone, lanceolate (outer) to linear (inner), abaxial faces with prominent glutinous ridge; outer and middle bodies appressed, entire, apices entire or finely serrulate, spines ascending, slender, 1–3 mm; apices of inner spreading to erect, narrow, ± flattened, finely serrulate, ± scabrous. Corollas dull white to lavender, 15–25 mm, tubes 7–11 mm, throats 5–7 mm, lobes 5–7 mm; style tips 5–7 mm. Cypselae brown, 3.5–7 mm, apical collars tan, 0.1–0.2 mm; pappi white or tawny, 15–20 mm.


Phenology: Flowering spring–summer (May–Aug).
Habitat: Grassy areas, open woodlands
Elevation: 500–1400 m

Discussion

Of conservation concern.

Cirsium ciliolatum is restricted to a few sites in and around the Klamath Range of Jackson County, Oregon, and Siskiyou County, California. It is listed by the state of California as endangered. It is closely related to C. undulatum and perhaps should be treated as a variety of that species. Pending a comprehensive study of the variation within C. undulatum, I have maintained C. ciliolatum as a distinct species.

Selected References

None.

Lower Taxa

None.

"fine" is not a number.

... more about "Cirsium ciliolatum"
white-tomentose +
arachnoid-tomentose +
short-tailed +
spineless +  and twisted +
serrulate +  and entire +
erect +  and spreading +
innermost +
scarious +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.02 cm0.2 mm <br />2.0e-4 m <br />) +
indeterminate +  and determinate +
David J. Keil +
(L. F. Henderson) J. T. Howell +
petiolate +  and winged +
short-decurrent +  and auriculate-clasping +
decurrent +
Cirsium undulatum var. ciliolatum +
compound +  and simple +
10 cm100 mm <br />0.1 m <br /> (30 cm300 mm <br />0.3 m <br />) +
oblongelliptic +
3cm;12cm +
spreading +  and erect +
10-nerved or 20-nerved +  and rugose +
tawny +  and white +
? (?) +  and ? (?) +
Ashland thistle +
actinomorphic +
white +  and lavender +
1.5 cm15 mm <br />0.015 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
compressed +  and ovoid +
fertile +  and bisexual +
Calif. +  and Oreg. +
500–1400 m +
gray-canescent +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Grassy areas, open woodlands +
indeterminate +
each +  and sessile +
1.5 cm15 mm <br />0.015 m <br /> (2.3 cm23 mm <br />0.023 m <br />) +
glabrate +  and arachnoid +
ovoid;hemispheric +
1.5 cm15 mm <br />0.015 m <br /> (3 cm30 mm <br />0.03 m <br />) +
sessile +  and petiolate +
cauline +  and basal +
bristle-tipped +
broadly triangular +  and linear-lanceolate +
0.1 cm1 mm <br />0.001 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
laciniate-pinnatifid +, lobed +, dentate +, undivided to coarsely +  and spiny-toothed +
2-carpellate +
tawny +  and white +
persistent +
1.5 cm15 mm <br />0.015 m <br /> (2 cm20 mm <br />0.02 m <br />) +
0 cm0 mm <br />0 m <br /> (15 cm150 mm <br />0.15 m <br />) +
Flowering spring–summer (May–Aug). +
middle +  and outer +
weakly to strongly +
papillate +  and smooth +
sessile +  and winged-petiolate +
Leafl. W. Bot. +
bearing subulate enations +, hairy +  and bristly +
flat;convex +
glutinous +
tawny;white +
setiform +  and plumose +
exalbuminous +
subequal +
Endemic +  and Conservation concern +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
spiny-winged +, simple +  and branched +
1 +  and several +
appendaged +  and truncate +
dilated +  and swollen +
enlarged +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
Cirsium howellii +
Cirsium ciliolatum +
species +
cylindric +
expanded +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
bristly-dentate to coarsely +
slender +
0.7 cm7 mm <br />0.007 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
tomentose +  and arachnoid +
60 cm600 mm <br />0.6 m <br /> (200 cm2,000 mm <br />2 m <br />) +
tree +, vine +, shrub +  and subshrub +