Cirsium grahamii

A. Gray

Smithsonian Contr. Knowl. 5(6): 102. 1853.

Common names: Graham’s thistle
Treatment appears in FNA Volume 19. Treatment on page 124. Mentioned on page 103, 114, 125, 150, 156.

Biennials, 50–100 cm; taproots slender and fascicles of thick fibrous-roots. Stems 1, erect, thinly arachnoid and/or puberulent to short-pilose, sometimes ± glabrate; branches 0–4, ascending. Leaves: blades oblanceolate to oblongelliptic, 20–30 × 3–8 cm, spinulose and otherwise entire or coarsely dentate to deeply pinnatifid, lobes entire or coarsely few toothed or lobed, main spines slender, 3–6 mm, abaxial ± persistently gray-tomentose, sometimes pilose along veins, adaxial faces thinly arachnoid and ± glabrate; basal often present at flowering, sessile or narrowly winged-petiolate; principal cauline gradually winged-petiolate or sessile, reduced distally, bases sometimes clasping or short-decurrent; distal cauline ascending, becoming bractlike, narrow, lobed or not. Heads 1–5. Peduncles 10–30 cm. Involucres hemispheric, 2–3 × 2–4 cm, thinly arachnoid or glabrous. Phyllaries in ca. 8 series, imbricate, proximally brownish, distally dark purplish, lanceolate to linear, margins of outer hispidulous-ciliolate, spiny-fringed, pinnately spiny or with scarious appendages, abaxial faces with prominent, glutinous ridge; outer and middle appressed or only apices spreading, bodies minutely spinulose-denticulate, spines erect to ascending, 1.5–2.5 mm; apices of inner phyllaries often flexuous, flat, scabridulous. Corollas deep purple, 22–30 mm, tubes 13–18 mm, throats 4–5 mm, lobes 5–8 mm; style tips 4–4.5 mm. Cypselae tan with dark speckles to dark purplish brown, 4–5.5 mm, apical collars not differently colored; pappi 13–18 mm. 2n = 32 (Mexico).


Phenology: Flowering Jul–Sep.
Habitat: Oak woodlands, coniferous forests, meadows, often in damp soil
Elevation: 1400–2600 m

Distribution

V19-85-distribution-map.gif

Ariz., N.Mex., Mexico (Chihuahua), Mexico (Durango), Mexico (Sonora)

Discussion

Cirsium grahamii occurs in the mountains of southeastern Arizona and southwestern New Mexico. It forms hybrid swarms with C. parryi and C. scariosum var. coloradense in the White Mountains of Arizona.

Selected References

None.

Lower Taxa

None.

"fine" is not a number.

... more about "Cirsium grahamii"
pilose +  and gray-tomentose +
glabrate +  and arachnoid +
short-tailed +
spineless +  and twisted +
dentate +, entire +  and spine-tipped +
scarious +
corymbiform +, paniculiform +, subcapitate +, spiciform +  and racemiform +
indeterminate +  and determinate +
David J. Keil +
A. Gray +
winged-petiolate +  and sessile +
short-decurrent +  and clasping +
decurrent +
Asteraceae tribe Cynareae +
compound +  and simple +
20 cm200 mm <br />0.2 m <br /> (30 cm300 mm <br />0.3 m <br />) +
oblanceolate;oblongelliptic +
3cm;8cm +
10-nerved or 20-nerved +  and rugose +
spinulose-denticulate +
tawny +  and white +
Graham’s thistle +
actinomorphic +
white +  and pink red yellow or purple +
2.2 cm22 mm <br />0.022 m <br /> (3 cm30 mm <br />0.03 m <br />) +
compressed +  and ovoid +
fertile +  and bisexual +
not +, lobed +  and bractlike +
Ariz. +, N.Mex. +, Mexico (Chihuahua) +, Mexico (Durango) +  and Mexico (Sonora) +
1400–2600 m +
gray-canescent +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Oak woodlands, coniferous forests, meadows, often in damp soil +
indeterminate +
each +  and sessile +
2 cm20 mm <br />0.02 m <br /> (3 cm30 mm <br />0.03 m <br />) +
glabrous +  and arachnoid +
hemispheric +
2 cm20 mm <br />0.02 m <br /> (4 cm40 mm <br />0.04 m <br />) +
sessile +  and petiolate +
cauline +  and basal +
bristle-tipped +
lobed +, toothed +, few +  and entire +
0.3 cm3 mm <br />0.003 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
entire +  and dentate +
usually lobed +  and dissected +
2-carpellate +
persistent +
1.3 cm13 mm <br />0.013 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
10 cm100 mm <br />0.1 m <br /> (30 cm300 mm <br />0.3 m <br />) +
Flowering Jul–Sep. +
middle +  and outer +
weakly to strongly +
papillate +  and smooth +
sessile +  and winged-petiolate +
Smithsonian Contr. Knowl. +
bearing subulate enations +, hairy +  and bristly +
flat;convex +
glutinous +
tawny;white +
setiform +  and plumose +
exalbuminous +
subequal +
erect +  and ascending +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
spiny-winged +, simple +  and branched +
appendaged +  and truncate +
dilated +  and swollen +
enlarged +
0.4 cm4 mm <br />0.004 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
Compositae +
Cirsium grahamii +
species +
cylindric +
expanded +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
bristly-dentate to coarsely +
slender +
1.3 cm13 mm <br />0.013 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
50 cm500 mm <br />0.5 m <br /> (100 cm1,000 mm <br />1 m <br />) +
tree +, vine +, shrub +  and subshrub +