Cirsium andersonii

(A. Gray) Petrak

Bot. Tiddsskr. 31: 68. 1911.

Common names: Anderson’s or rose thistle
Endemic
Basionym: Cnicus andersonii A. Gray Proc. Amer. Acad. Arts 10: 44. 1874
Treatment appears in FNA Volume 19. Treatment on page 145. Mentioned on page 101, 131, 146.

Perennials (but often appearing biennial), (15–) 40–70 (–100) cm; rootstocks producing erect, taprooted caudices and rosettes. Stems usually 1, erect, subglabrous to puberulent and/or tomentose; branches 0–several, stiffly ascending. Leaves: blades ± elliptic, 8–35 × 4–8 cm, divided about halfway to midveins, lobes spreading, triangular, coarsely dentate or with a few broad lobes, obtuse to acute, main spines 1–5 mm, abaxial faces green or gray, thinly tomentose, adaxial green and glabrous to sparingly pilose; basal often present at flowering, spiny winged-petiolate; main cauline reduced distally, bases clasping; distal much reduced, linear-oblong, usually less deeply lobed and often spinier than proximal. Heads 1–6, borne singly or in corymbiform, racemiform, or spiciform arrays. Peduncles 0–20 cm. Involucres broadly cylindric to narrowly campanulate, 3–5 × 2–4 cm, loosely arachnoid or ± glabrous, finely short-ciliate. Phyllaries in 6–8 series, imbricate, outer green, inner purple to red, linear-lanceolate (outer) to linear (inner), abaxial faces without glutinous ridge; outer and mid bodies short, appressed, entire or spinulose-ciliate, apices long-spreading to ascending, entire or spinulose-ciliate or rarely with expanded, fringed appendages, spines straight, weak, 1–3 mm; apices of inner red to purple, straight or rarely twisted, long, flat, entire. Corollas red to reddish purple, 30–45 mm, tubes 10–20 mm, throats 10–16 mm, lobes 9–11 mm; style tips 3.5–5 mm. Cypselae brown, 6–7 mm, apical collars narrow; pappi 25–40 mm. 2n = 32, 64.


Phenology: Flowering summer (Jul–Sep).
Habitat: Moist to dry soils, openings in montane woodlands, montaine coniferous forests, aspen groves
Elevation: 1100–2900 m

Discussion

Cirsium andersonii grows in the Cascade Range of northern California south through the Sierra Nevada of eastern California and western Nevada. It has been reported from the mountains of southwestern Idaho, but I have not seen specimens from there.

Heads of Cirsium andersonii are actively visited by hummingbirds as well as a variety of insects (P. L. Barlow-Irick 2002).

Selected References

None.

Lower Taxa

None.

"fine" is not a number.

... more about "Cirsium andersonii"
gray +  and green +
glabrous +  and sparingly pilose +
short-tailed +
rarely +, spinulose-ciliate +  and entire +
dentate +, entire +  and spine-tipped +
long-spreading +  and ascending +
innermost +
scarious +
spiciform +, racemiform +  and corymbiform +
indeterminate +  and determinate +
David J. Keil +
(A. Gray) Petrak +
winged-petiolate +
decurrent +
Cnicus andersonii +
compound +  and simple +
8 cm80 mm <br />0.08 m <br /> (35 cm350 mm <br />0.35 m <br />) +
divided +
4cm;8cm +
10-nerved or 20-nerved +  and rugose +
tawny +  and white +
? (?) +  and ? (?) +
Anderson’s or rose thistle +
actinomorphic +
red +  and reddish purple +
3 cm30 mm <br />0.03 m <br /> (4.5 cm45 mm <br />0.045 m <br />) +
compressed +  and ovoid +
fertile +  and bisexual +
usually less deeply lobed and often spinier +
lobed +  and linear-oblong +
Calif. +, Idaho +  and Nev. +
1100–2900 m +
gray-canescent +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Moist to dry soils, openings in montane woodlands, montaine coniferous forests, aspen groves +
in corymbiform , racemiform or spiciform , arrays +  and singly +
indeterminate +
each +  and sessile +
3 cm30 mm <br />0.03 m <br /> (5 cm50 mm <br />0.05 m <br />) +
glabrous +  and arachnoid +
broadly cylindric;narrowly campanulate +
2 cm20 mm <br />0.02 m <br /> (4 cm40 mm <br />0.04 m <br />) +
sessile +  and petiolate +
cauline +  and basal +
bristle-tipped +
with a few broad lobes +  and dentate +
obtuse +  and acute +
0.1 cm1 mm <br />0.001 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
entire +  and dentate +
usually lobed +  and dissected +
spinulose-ciliate +  and entire +
2-carpellate +
persistent +
2.5 cm25 mm <br />0.025 m <br /> (4 cm40 mm <br />0.04 m <br />) +
0 cm0 mm <br />0 m <br /> (20 cm200 mm <br />0.2 m <br />) +
Flowering summer (Jul–Sep). +
middle +  and outer +
weakly to strongly +
papillate +  and smooth +
Bot. Tiddsskr. +
bearing subulate enations +, hairy +  and bristly +
flat;convex +
glutinous +
tawny;white +
setiform +  and plumose +
exalbuminous +
subequal +
straight +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
spiny-winged +, simple +  and branched +
appendaged +  and truncate +
dilated +  and swollen +
enlarged +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Compositae +
Cirsium andersonii +
species +
cylindric +
expanded +
1 cm10 mm <br />0.01 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
bristly-dentate to coarsely +
slender +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
70 cm700 mm <br />0.7 m <br /> (100 cm1,000 mm <br />1 m <br />) +
40 cm400 mm <br />0.4 m <br /> (70 cm700 mm <br />0.7 m <br />) +
tree +, vine +, shrub +  and subshrub +