Cirsium scariosum var. congdonii

(R. J. Moore & Frankton) D. J. Keil

Sida 21: 215. 2004.

Common names: Rosette thistle
Endemic
Basionym: Cirsium congdonii R. J. Moore & Frankton Canad. J. Bot. 45: 1738. 1967
Treatment appears in FNA Volume 19. Treatment on page 158. Mentioned on page 155.

Plants acaulescent or nearly so (with dense rosettes of leaves and cluster of sessile or subsessile heads). Stems absent or very short, simple, stout, fleshy, very leafy. Leaves: blades oblong to oblanceolate or elliptic, shallowly pinnately lobed or sometimes unlobed, longer spines slender, less than 1 cm, abaxial faces green and ± glabrous to white-tomentose, adaxial faces green, glabrous or villous with septate trichomes. Heads 1–many, sessile or subsessile, crowded. Involucres 2–3 cm. Phyllaries: outer and mid lanceolate to ovate, spines slender, 1–4 mm; apices of inner linear-acuminate, often twisted, entire or minutely toothed. Corollas pink to reddish purple, 22–30 mm, tubes 10–15 mm, throats 5–7.5 mm, lobes 4–7 mm; style tips 3–5 mm. Cypselae 4–4.5 mm; pappi 17–28 mm. 2n = 34 (as C. congdonii).


Phenology: Flowering summer (Jun–Aug).
Habitat: Meadows, springs, stream banks
Elevation: 1500–3100 m

Discussion

Variety congdonii grows from the Sierra Nevada of western Nevada and eastern California to the San Bernardino Mountains of southern California.

Selected References

None.

Lower Taxa

None.

"fine" is not a number."narrower" is not a number.

less glabrous +  and white-tomentose +
villous +  and glabrous +
short-tailed +
dentate +, entire +  and spine-tipped +
erect +  and spreading +
innermost +
scarious +
subcapitate +, racemiform +  and spiciform +
indeterminate +  and determinate +
David J. Keil +
(R. J. Moore & Frankton) D. J. Keil +
winged-petiolate +  and sessile +
decurrent +
Cirsium congdonii +
compound +  and simple +
linear to elliptic +
5 cm50 mm <br />0.05 m <br /> (20 cm200 mm <br />0.2 m <br />) +
unlobed;lobed;oblong;oblanceolate or elliptic +
3cm;7cm +
10-nerved or 20-nerved +  and rugose +
tawny +  and white +
? (?) +  and ? (?) +
Rosette thistle +
actinomorphic +
pink +  and reddish purple +
2.2 cm22 mm <br />0.022 m <br /> (3 cm30 mm <br />0.03 m <br />) +
light +  and dark-brown +
compressed +  and ovoid +
fertile +  and bisexual +
Calif. +  and Nev. +
1500–3100 m +
gray-canescent +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Meadows, springs, stream banks +
subsessile +  and sessile +
indeterminate +
each +  and sessile +
2 cm20 mm <br />0.02 m <br /> (4 cm40 mm <br />0.04 m <br />) +
glabrate +  and arachnoid +
ovoid;hemispheric +
2 cm20 mm <br />0.02 m <br /> (3 cm30 mm <br />0.03 m <br />) +
1.5 cm15 mm <br />0.015 m <br /> (6 cm60 mm <br />0.06 m <br />) +
sessile +  and petiolate +
cauline +  and basal +
bristle-tipped +
lobed +, spinose-dentate +, linear-lanceolate +  and broadly triangular +
0 cm0 mm <br />0 m <br /> (?) +  and 1 cm10 mm <br />0.01 m <br /> (?) +
0.2 cm2 mm <br />0.002 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
entire +  and dentate +
scarious-fringed +  and entire +
rounded +
2-carpellate +
white +  and tan +
persistent +
1.7 cm17 mm <br />0.017 m <br /> (2.8 cm28 mm <br />0.028 m <br />) +
0 cm0 mm <br />0 m <br /> (10 cm100 mm <br />0.1 m <br />) +
Flowering summer (Jun–Aug). +
middle +  and outer +
weakly to strongly +
short-caulescent +  and acaulescent +
papillate +  and smooth +
bearing subulate enations +, hairy +  and bristly +
flat;convex +
glutinous +
tawny;white +
setiform +  and plumose +
exalbuminous +
subequal +
erect +  and spreading +
flattened +
0.1 cm1 mm <br />0.001 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
leafy +  and simple +
appendaged +  and truncate +
dilated +  and swollen +
enlarged +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Cirsium hookerianum var. scariosum +
Cirsium scariosum var. congdonii +
Cirsium scariosum +
variety +
cylindric +
expanded +
0.5 cm5 mm <br />0.005 m <br /> (0.75 cm7.5 mm <br />0.0075 m <br />) +
tipped +  and spineless +
scabro-denticulate +  and narrowed +
expanded +
bristly-dentate to coarsely +
slender +
1 cm10 mm <br />0.01 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
taprooted +, caulescent +  and acaulescent +
perennial +  and biennial +
0 cm0 mm <br />0 m <br /> (200 cm2,000 mm <br />2 m <br />) +
nearly +  and acaulescent +