Cirsium andrewsii

(A. Gray) Jepson

Fl. W. Calif., 506. 1901.

Common names: Franciscan thistle
EndemicConservation concern
Basionym: Cnicus andrewsii A. Gray Proc. Amer. Acad. Arts 10: 45. 1874
Treatment appears in FNA Volume 19. Treatment on page 141. Mentioned on page 104, 160.

Biennials (or short–lived monocarpic perennials), 60–200 cm; taprooted. Stems several, erect to spreading, thinly arachnoid, soon glabrous; branches ± fleshy, usually much branched proximally, spreading to ascending. Leaves: blades ± elliptic, 30–75 × 10–20 cm, shallowly to deeply pinnatifid, lobes oblong to ovate, unlobed or with several prominent secondary lobes or large teeth, obtuse to acute, main spines 2–7 mm, abaxial gray arachnoid-tomentose, adaxial faces thinly arachnoid, glabrate; basal often present at flowering, spiny winged-petiolate; principal cauline sessile, bases clasping with broad, spiny-margined auricles, reduced distally, spinier than proximal; distal much reduced, spines 7–20 mm. Heads several–many, in congested corymbiform arrays. Peduncles 0–7 cm. Involucres ovoid to hemispheric or campanulate, 1.5–3 × 1.5–5 cm, sparsely to densely arachnoid, finely short-ciliate. Phyllaries in ca. 6 series, dark green or brown or with stramineous margins and a darker central zone, imbricate, linear-lanceolate (outer) to linear (inner), abaxial faces without glutinous ridge; outer and mid bodies appressed, spiny-ciliate, apices long-spreading to ascending long-acuminate, spines straight, stout, 5–15 mm; apices of inner straight or twisted, long, entire, flat or spine-tipped. Corollas dark reddish purple, 17–24 mm, tubes 8–11 mm, throats 3.5–6 mm, lobes 5–7 mm; style tips 3–4 mm. Cypselae dark-brown, 4–5 mm, apical collars narrow; pappi 15 mm. 2n = 32.


Phenology: Flowering spring–summer (May–Sep).
Habitat: Headlands, ravines, seeps near coast, sometimes on serpentine
Elevation: 0–100 m

Discussion

Of conservation concern.

Cirsium andrewsii occurs along the coast of north-central California from San Mateo to Marin counties. It reportedly hybridizes with C. quercetorum (F. Petrak 1917; J. T. Howell 1960b).

Selected References

None.

Lower Taxa

None.

"broad" is not a number."fine" is not a number.

... more about "Cirsium andrewsii"
arachnoid-tomentose +
glabrate +  and arachnoid +
short-tailed +
spineless +  and twisted +
dentate +, entire +  and spine-tipped +
long-spreading +  and ascending +
innermost +
scarious +
indeterminate +  and determinate +
spiny-margined +
David J. Keil +
(A. Gray) Jepson +
winged-petiolate +
decurrent +
reduced +
Cnicus andrewsii +
compound +  and simple +
30 cm300 mm <br />0.3 m <br /> (75 cm750 mm <br />0.75 m <br />) +
pinnatifid +
10cm;20cm +
spine-tipped +, flat +  and entire +
10-nerved or 20-nerved +  and rugose +
spreading;ascending +
tawny +  and white +
Franciscan thistle +
actinomorphic +
dark reddish +
1.7 cm17 mm <br />0.017 m <br /> (2.4 cm24 mm <br />0.024 m <br />) +
compressed +  and ovoid +
fertile +  and bisexual +
0–100 m +
gray-canescent +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Headlands, ravines, seeps near coast, sometimes on serpentine +
indeterminate +
each +  and sessile +
1.5 cm15 mm <br />0.015 m <br /> (3 cm30 mm <br />0.03 m <br />) +
ovoid;hemispheric or campanulate +
1.5 cm15 mm <br />0.015 m <br /> (5 cm50 mm <br />0.05 m <br />) +
sessile +  and petiolate +
cauline +  and basal +
bristle-tipped +
obtuse +  and acute +
0.2 cm2 mm <br />0.002 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
entire +  and dentate +
stramineous +
usually lobed +  and dissected +
2-carpellate +
persistent +
15 cm150 mm <br />0.15 m <br /> (?) +
0 cm0 mm <br />0 m <br /> (7 cm70 mm <br />0.07 m <br />) +
Flowering spring–summer (May–Sep). +
middle +  and outer +
weakly to strongly +
papillate +  and smooth +
Fl. W. Calif., +
bearing subulate enations +, hairy +  and bristly +
flat;convex +
glutinous +
tawny;white +
setiform +  and plumose +
exalbuminous +
subequal +
Endemic +  and Conservation concern +
straight +
0.5 cm5 mm <br />0.005 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
spiny-winged +, simple +  and branched +
erect +  and spreading +
appendaged +  and truncate +
dilated +  and swollen +
enlarged +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
Compositae +
Cirsium andrewsii +
species +
cylindric +
expanded +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
bristly-dentate to coarsely +
slender +
0.8 cm8 mm <br />0.008 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
60 cm600 mm <br />0.6 m <br /> (200 cm2,000 mm <br />2 m <br />) +
tree +, vine +, shrub +  and subshrub +