cocklebur


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cocklebur

or

clotbur,

any species of the genus Xanthium, widely distributed, coarse annual plants of the family Asteraceae (asteraster
[Gr.,=star], common name for the Asteraceae (Compositae), the aster family, in North America, name for plants of the genus Aster, sometimes called wild asters, and for a related plant more correctly called China aster (Callistephus chinensis
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 family). They are often persistent weeds; the two-seeded oval burrs are particularly troublesome to sheep growers and the very young plants are poisonous to livestock. Cockleburs are often confused with burdock. Cockleburs are classified in the division MagnoliophytaMagnoliophyta
, division of the plant kingdom consisting of those organisms commonly called the flowering plants, or angiosperms. The angiosperms have leaves, stems, and roots, and vascular, or conducting, tissue (xylem and phloem).
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, class Magnoliopsida, order Asterales, family Asteraceae.

Cocklebur

 

plant of the genus Xanthium; annual grasses of the Compositae family. The flowers are tubular and unisexual and are formed in unisexual calathide heads. The staminal calathides are multiflorous, round, and apical; the pistil calathides each have two blossoms; both develop on a single plant. Estimates of the number of species range from just a few to 25, and they are found all over the world. There are seven species in the USSR. The most widely found is burweed (X. strumarium), which grows as a weed on vacant land, on cultivated land, and in gardens, along roads, and near houses. Thorny cocklebur (X. spinosum), which has long two- or three-segment spikes at the base of its leaves, is found in the southern regions of the USSR (in refuse areas, along roads, and in pastures).

T. V. EGOROVA

References in periodicals archive ?
Evidently, some of the cocklebur mallards had flown in his direction.
Plants that cause mechanical injury: Clover, Cocklebur, Downy Brome grass, Sand Bur, Squirrel tail grass
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Weeds controlled include marestail, waterhemp, common lambsquarters, velvetleaf, common and giant ragweed, pigweed, morningglory, cocklebur, smartweed, nightshade, sunflower and kochia.
They are quackgrass, Canada thistle, burdock, white or oxeye daisy, snapdragon or butter and eggs, cocklebur, perennial sow thistle, sour dock, yellow dock, wild mustard, wild parsnip, and Russian thistle.
While results have been encouraging, large-seeded weeds like velvet-leaf and cocklebur still sprouted after night tilling.
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In late summer and fall weeds such as ragweed, sagebrush, pigweed, Russian thistle and cocklebur become problematic for allergy sufferers.
For 2 more years, the team tried tissues from various plants: lettuce, cocklebur, albino barley, and the like.
Of all the sticky pests in the field, the cocklebur is the arch villain.
Cloransulam-methyl provides excellent control of cocklebur, common and giant ragweed, sunflower, morning-glory and velvetleaf from either soil-applied or post-emergence applications," said Ben Kaehler, Product Manager for Dow AgroSciences.
Another weed that's unfortunately no stranger to soybean farmers is common cocklebur, an invader that has run rampant across the entire United States.