Chondrilla juncea

Linnaeus

Sp. Pl. 2: 796. 1753.

Common names: Rush skeletonweed
WeedyIntroducedIllustrated
Treatment appears in FNA Volume 19. Treatment on page 253.

Stems with retrorse, coarse, bristly hairs on basal 10–15 cm, distally glabrous. Leaves: basal withered before flowering, blades 5–13 × 1.5–3 cm. Involucres 9–12 mm. Phyllaries tomentose. Cypselae: bodies 3–4 mm, beaks 5–6 mm, ribs with antrorse tubercles distally; pappi 5–6 mm. 2n = 15.


Phenology: Flowering Jul–Oct.
Habitat: Roadsides, rangelands, grain fields, waste places and other disturbed ground
Elevation: 0–600 m

Distribution

V19-334-distribution-map.gif

Introduced; B.C., Ont., Calif., Del., D.C., Ga., Idaho, Ill., Md., Mich., Mont., N.J., Oreg., Pa., Va., Wash., W.Va., Eurasia, Africa, Australia

Discussion

Chondrilla juncea is native to the Mediterranean region of Europe, North Africa, and Asia Minor. It is a weed in North America (not listed as noxious at the federal level). Its deep and extensive root system competes strongly for soil moisture and nutrients and makes control difficult because it helps the plants survive drought, cultivation, grazing, and most selective herbicides. The large, stiff branches and stems interfere with harvesting. The species is said to be “the most serious weed of Australian wheat-growing regions” (F. D. Panetta and J. Dodd 1987). It also infests millions of acres in California, Idaho, Oregon, and Washington.

Chondrilla juncea is an obligate apomict; its seeds are formed by a parthenogenetic process (E. Battaglia 1949). Nevertheless, the species is highly variable in morphology and biochemical traits.

Selected References

None.

Lower Taxa

None.

"fine" is not a number.

... more about "Chondrilla juncea"
scarious +
ovate +  and lanceolate +
paniculiform +  and corymbiform +
indeterminate +  and determinate +
L. D. Gottlieb +
Linnaeus +
10 cm100 mm <br />0.1 m <br /> (15 cm150 mm <br />0.15 m <br />) +
decurrent +
stout +  and slender +
0.5 cm5 mm <br />0.005 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
compound +  and simple +
5 cm50 mm <br />0.05 m <br /> (13 cm130 mm <br />0.13 m <br />) +
toothed;coarsely;pinnatifid;oblanceolate +
1.5cm;3cm +
tuberculate +, rugose +, muricate +  and smooth +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
filiform +
Rush skeletonweed +
zygomorphic +, actinomorphic +  and (3-)5-merous +
tan +  and black +
cylindric +
B.C. +, Ont. +, Calif. +, Del. +, D.C. +, Ga. +, Idaho +, Ill. +, Md. +, Mich. +, Mont. +, N.J. +, Oreg. +, Pa. +, Va. +, Wash. +, W.Va. +, Eurasia +, Africa +  and Australia +
0–600 m +
winged +  and beaked +
dispersed +
Roadsides, rangelands, grain fields, waste places and other disturbed ground +
indeterminate +
each +  and sessile +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.9 cm9 mm <br />0.009 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
cauline +  and basal +
divided +, lobed +  and dentate +
2-carpellate +
persistent +
0.5 cm5 mm <br />0.005 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
not inflated +
Flowering Jul–Oct. +
connate +  and distinct +
subequal +  and unequal +
flat;convex +
exalbuminous +
Weedy +, Introduced +  and Illustrated +
ascending +  and erect +
1 +  and 6 +
appendaged +  and truncate +
papillate +
Undefined tribe Lactuceae +
Chondrilla juncea +
Chondrilla +
species +
40 cm400 mm <br />0.4 m <br /> (150 cm1,500 mm <br />1.5 m <br />) +
shrub +  and subshrub +