Cirsium inamoenum var. inamoenum

Common names: Greene’s thistle
Treatment appears in FNA Volume 19. Treatment on page 135.

Involucres 1.5–5 cm diam. Corollas white or pale lavender. 2n = 32, 34, 36 (as C. subniveum).


Phenology: Flowering summer (Jun–Aug).
Habitat: Arid slopes, roadsides, grasslands, sagebrush scrub, pinyon-juniper woodlands, montane coniferous forests
Elevation: 750–2800 m

Distribution

V19-109-distribution-map.gif

Calif., Idaho, Nev., Oreg., Utah, Wash., Wyo.

Discussion

Variety inamoenum grows from the rainshadow slopes of the Sierra Nevada and Cascades eastward across the northern Basin and Range province to the mountains of southern Idaho, western Wyoming, and northeastern Utah. On the slopes of Steens Mountain in eastern Oregon it forms hybrids with Cirsium eatonii var. peckii. In the Snake Range it apparently hybridizes with C. eatonii var. viperinum.

Selected References

None.

Lower Taxa

None.

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

36 +, 34 +  and 32 +
glabrate +  and gray-tomentose +
gray;more or less green +
glabrate +  and tomentose +
short-tailed +
spineless +  and spine-tipped +
spineless +  and twisted +
dentate +, entire +  and spine-tipped +
erect +  and spreading +
innermost +
rounded;acute +
scarious +
not differentiated +
corymbiform +  and open +
indeterminate +  and determinate +
David J. Keil +
(Greene) D. J. Keil +
winged-petiolate +
spiny-winged +
decurrent +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
Carduus inamoenus +
compound +  and simple +
10 cm100 mm <br />0.1 m <br /> (35 cm350 mm <br />0.35 m <br />) +
linear;lance-triangular spinulose +
1 cm10 mm <br />0.01 m <br /> (7 cm70 mm <br />0.07 m <br />) +
10-nerved or 20-nerved +  and rugose +
tawny +  and white +
Greene’s thistle +
actinomorphic +
pale lavender +  and white +
1.9 cm19 mm <br />0.019 m <br /> (3.1 cm31 mm <br />0.031 m <br />) +
compressed +  and ovoid +
fertile +  and bisexual +
less deeply divided +, unlobed +  and bractlike +
Calif. +, Idaho +, Nev. +, Oreg. +, Utah +, Wash. +  and Wyo. +
750–2800 m +
gray-canescent +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Arid slopes, roadsides, grasslands, sagebrush scrub, pinyon-juniper woodlands, montane coniferous forests +
indeterminate +
each +  and sessile +
1.5 cm15 mm <br />0.015 m <br /> (5 cm50 mm <br />0.05 m <br />) +
2 cm20 mm <br />0.02 m <br /> (3 cm30 mm <br />0.03 m <br />) +
loosely floccose +  and densely arachnoid +
hemispheric;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 +
deltate +, usually narrowly triangular +  and more or less linear +
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 +
ascending +  and spreading +
2-carpellate +
pinnatifid +  and dentate +
persistent +
1.2 cm12 mm <br />0.012 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
0 cm0 mm <br />0 m <br /> (25 cm250 mm <br />0.25 m <br />) +
Flowering summer (Jun–Aug). +
middle +  and outer +
papillate +  and smooth +
bearing subulate enations +, hairy +  and bristly +
flat;convex +
glutinous +
tawny;white +
setiform +  and plumose +
exalbuminous +
subequal +
ascending +  and abruptly spreading +
0.2 cm2 mm <br />0.002 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
spiny-winged +, simple +  and branched +
gray-tomentose +
1 +  and several +
appendaged +  and truncate +
dilated +  and swollen +
enlarged +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
Compositae +
Cirsium inamoenum var. inamoenum +
Cirsium inamoenum +
variety +
cylindric +
expanded +
0.65 cm6.5 mm <br />0.0065 m <br /> (0.95 cm9.5 mm <br />0.0095 m <br />) +
bristly-dentate to coarsely +
slender +
0.7 cm7 mm <br />0.007 m <br /> (1.3 cm13 mm <br />0.013 m <br />) +
perennial +  and biennial +
20 cm200 mm <br />0.2 m <br /> (100 cm1,000 mm <br />1 m <br />) +
tree +, vine +, shrub +  and subshrub +