Cirsium cymosum var. canovirens

(Rydberg) D. J. Keil

Sida 21: 212. 2004.

Common names: Graygreen thistle
Endemic
Basionym: Carduus canovirens Rydberg Mem. New York Bot. Gard. 1: 450. 1900
Synonyms: Cirsium canovirens (Rydberg) Petrak
Treatment appears in FNA Volume 19. Treatment on page 136.

Larger heads 15–25 mm diam. Outer phyllaries usually much shorter than inner; glutinous ridge prominent, well developed, appearing dark-brown on dry specimens. 2n = 34 (as C. canovirens).


Phenology: Flowering spring–summer (Apr–Aug).
Habitat: Grasslands, sagebrush steppe, pinyon-juniper woodlands, dry coniferous forests, roadsides
Elevation: 600–2600 m

Distribution

V19-113-distribution-map.gif

Calif., Idaho, Mont., Nev., Oreg., Wyo.

Discussion

Variety canovirens occurs from the dry mountains and valleys of eastern Oregon and the rain shadow slopes of the northern Sierra Nevada eastward across the northern Great Basin to Idaho, southern Montana, and western Wyoming. D. J. Keil and C. E. Turner (1993) recognized a polymorphic Cirsium canovirens that included C. subniveum (here treated as C. inamoenum). My subsequent investigations indicate that the merger of those taxa was erroneous, based in part on mis-identified specimens.

Selected References

None.

Lower Taxa

None.

"common" is not a number."fine" is not a number."fine" is not a number.

short-tailed +
spineless +  and twisted +
dentate +, entire +  and spine-tipped +
subappressed +  and ascending or spreading +
innermost +
scarious +
not differentiated +
racemiform +  and corymbiform +
indeterminate +  and determinate +
David J. Keil +
(Rydberg) D. J. Keil +
winged-petiolate +  and sessile +
auriculate +  and narrowed +
Carduus canovirens +
compound +  and simple +
10 cm100 mm <br />0.1 m <br /> (30 cm300 mm <br />0.3 m <br />) +
pinnatifid;linear-oblong;oblanceolate or elliptic +
2 cm20 mm <br />0.02 m <br /> (?) +
3cm;7cm +
10-nerved or 20-nerved +  and rugose +
ascending;arising +
tawny +  and white +
? (?) +  and ? (?) +
Graygreen thistle +
actinomorphic +
creamy white +  and purplish +
2 cm20 mm <br />0.02 m <br /> (3.1 cm31 mm <br />0.031 m <br />) +
tan +  and dark-brown +
compressed +  and ovoid +
fertile +  and bisexual +
less deeply divided and sometimes spinier +, short-decurrent +, auriculate-clasping +  and sessile +
divided +, unlobed +  and bractlike +
0.1 cm1 mm <br />0.001 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Calif. +, Idaho +, Mont. +, Nev. +, Oreg. +  and Wyo. +
600–2600 m +
green;gray +
deciduous +
villous +  and arachnoid-tomentose +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Grasslands, sagebrush steppe, pinyon-juniper woodlands, dry coniferous forests, roadsides +
indeterminate +
each +  and sessile +
2 cm20 mm <br />0.02 m <br /> (3 cm30 mm <br />0.03 m <br />) +
glabrate +  and arachnoid-floccose +
ovoid;hemispheric or campanulate +
1.5 cm15 mm <br />0.015 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
1.5 cm15 mm <br />0.015 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
sessile +  and petiolate +
well-developed +
cauline +  and basal +
bristle-tipped +
linear +  and triangular-ovate dentate +
0.2 cm2 mm <br />0.002 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
entire +  and dentate +
usually lobed +  and dissected +
2-carpellate +
persistent +
1.6 cm16 mm <br />0.016 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
0 cm0 mm <br />0 m <br /> (2 cm20 mm <br />0.02 m <br />) +
2 cm20 mm <br />0.02 m <br /> (15 cm150 mm <br />0.15 m <br />) +
Flowering spring–summer (Apr–Aug). +
middle +  and outer +
papillate +  and smooth +
sessile +  and winged-petiolate +
bearing subulate enations +, hairy +  and bristly +
flat;convex +
glutinous +
tawny;white +
setiform +  and plumose +
exalbuminous +
subequal +
ascending +  and spreading +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
spiny-winged +, simple +  and branched +
appendaged +  and truncate +
dilated +  and swollen +
enlarged +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
Cirsium canovirens +
Cirsium cymosum var. canovirens +
Cirsium cymosum +
variety +
cylindric +
expanded +
0.55 cm5.5 mm <br />0.0055 m <br /> (1 cm10 mm <br />0.01 m <br />) +
bristly-dentate to coarsely +
septate +  and non-septate +
arachnoid +  and fine +
perennial +, deciduous +  and biennial +
25 cm250 mm <br />0.25 m <br /> (120 cm1,200 mm <br />1.2 m <br />) +
slender +
0.8 cm8 mm <br />0.008 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
perennial +, biennial +  and annual +
5 cm50 mm <br />0.05 m <br /> (400 cm4,000 mm <br />4 m <br />) +
tree +, vine +, shrub +  and subshrub +