Cirsium ownbeyi

S. L. Welsh

Great Basin Naturalist 42: 200. 1982.

Common names: Ownbey’s thistle
Endemic
Treatment appears in FNA Volume 19. Treatment on page 153. Mentioned on page 105.

Perennials, 30–70 cm; taproots and branched caudices with persistent dark-brown leaf-bases. Stems 1–several, erect, simple or sparingly branched in distal 1/2, glabrous or thinly arachnoid and sparingly villous with jointed trichomes. Leaves: blades oblong to elliptic or oblanceolate, 15–30+ × 2–7 cm, deeply 2–3-pinnately divided, lobes linear to linear-lanceolate, spinulose to spiny-dentate or shallowly lobed, main spines slender, 2–8 mm, abaxial faces glabrous to thinly tomentose and villous along major veins, soon glabrescent, adaxial glabrous; basal present at flowering, narrowly spiny winged-petiolate; principal cauline well distributed, proximal winged-petiolate, mid and distal sessile, gradually reduced, bases decurrent as spiny wings 1–3 cm; distalmost reduced to spiny-pectinate bracts. Heads 1–few, erect, ± crowded in corymbiform arrays. Peduncles 0–4 cm. Involucres ovoid, 1.8–2.5 cm, 1.5–2.5 cm diam., loosely arachnoid, glabrate. Phyllaries in 5–6 series, imbricate, green, linear-lanceolate, abaxial faces without or with poorly developed glutinous ridge; outer and mid-bases appressed, apices stiffly radiating to ascending, long, very narrow, entire, spines slender, 3–10 mm; apices of inner straight, flexuous. Corollas white to pink or pink-purple, 16–20 mm, tubes 6–8 mm, throats 5–6 mm, lobes 5–7 mm; style tips 3.5–4.5 mm. Cypselae brown, ca. 4 mm, apical collars not differentiated; pappi 13–17 mm.


Phenology: Flowering summer (Jun–Aug).
Habitat: Stony soils in sparsely vegetated areas of pinyon-juniper woodlands, sagebrush scrub, arid grasslands, and riparian scrub, in dry sites or sometimes on seeps
Elevation: 1500–2400 m

Discussion

Cirsium ownbeyi is endemic to the eastern side of the Uintah Mountains in northeastern Utah, southwestern Wyoming, and northwestern Colorado. It is in the Center for Plant Conservation’s National Collection of Endangered Plants.

Selected References

None.

Lower Taxa

None.

"fine" is not a number."[" is not declared as a valid unit of measurement for this property."]" is not declared as a valid unit of measurement for this property.

... more about "Cirsium ownbeyi"
glabrescent +, villous +, glabrous +  and thinly tomentose +
short-tailed +
spineless +  and twisted +
innermost +
scarious +
not differentiated +
indeterminate +  and determinate +
David J. Keil +
S. L. Welsh +
winged-petiolate +
decurrent +
Asteraceae tribe Cynareae +
compound +  and simple +
15 cm150 mm <br />0.15 m <br /> (30 cm300 mm <br />0.3 m <br />) +
divided;oblong;elliptic or oblanceolate +
2cm;7cm +
10-nerved or 20-nerved +  and rugose +
spiny-pectinate +
tawny +  and white +
? (?) +  and ? (?) +
Ownbey’s thistle +
actinomorphic +
white +  and pink or pink-purple +
1.6 cm16 mm <br />0.016 m <br /> (2 cm20 mm <br />0.02 m <br />) +
compressed +  and ovoid +
fertile +  and bisexual +
Colo. +, Utah +  and Wyo. +
1500–2400 m +
gray-canescent +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Stony soils in sparsely vegetated areas of pinyon-juniper woodlands, sagebrush scrub, arid grasslands, and riparian scrub, in dry sites or sometimes on seeps +
indeterminate +
each +  and sessile +
1.5 cm15 mm <br />0.015 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
glabrate +  and arachnoid +
1.8 cm18 mm <br />0.018 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
sessile +  and petiolate +
cauline +  and basal +
bristle-tipped +
lobed +, spiny-dentate +, linear +  and linear-lanceolate +
0.2 cm2 mm <br />0.002 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
entire +  and dentate +
usually lobed +  and dissected +
2-carpellate +
persistent +
1.3 cm13 mm <br />0.013 m <br /> (1.7 cm17 mm <br />0.017 m <br />) +
0 cm0 mm <br />0 m <br /> (4 cm40 mm <br />0.04 m <br />) +
Flowering summer (Jun–Aug). +
middle +  and outer +
weakly to strongly +
papillate +  and smooth +
Great Basin Naturalist +
bearing subulate enations +, hairy +  and bristly +
flat;convex +
glutinous +
tawny;white +
setiform +  and plumose +
exalbuminous +
subequal +
0.3 cm3 mm <br />0.003 m <br /> (1 cm10 mm <br />0.01 m <br />) +
branched +  and simple +
1 +  and several +
appendaged +  and truncate +
dilated +  and swollen +
enlarged +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
Compositae +
Cirsium ownbeyi +
species +
cylindric +
expanded +
0.5 cm5 mm <br />0.005 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
bristly-dentate to coarsely +
slender +
0.6 cm6 mm <br />0.006 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
30 cm300 mm <br />0.3 m <br /> (70 cm700 mm <br />0.7 m <br />) +
tree +, vine +, shrub +  and subshrub +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +