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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.



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).


References in periodicals archive ?
We analyzed the case retrospectively and conjectured that retrieving the left lung cocklebur fruit first may have been safer and more effective than attempting to retrieve the one on the right.
For example, it is possible to take a short-day plant such as cocklebur (Xanthium) and place it under long-day conditions so that the plant remains entirely vegetative.
Common cocklebur (Xanthium pensylvanicum) is an annual weed that reproduces sexually by seed.
Moreover, the voice creates an illusion of earthiness by incorporating colloquialisms and poor grammar into its monologue when Roger flies in the first race, declaring that if "we were all back on the farm now I would say somebody has put a cocklebur under Roger's--well, you know where: maybe it was Mrs Shumann did it .
Consider the inventor of Velcro, a Swiss engineer by the name of George de Mestral, who, upon placing a cocklebur under a microscope, began an eight-year obsession to emulate the burr-clasping system.
LEAF DYNAMICS Peak, Mott, and their collaborators compared the movements of patches of synchronized pores in cocklebur leaves to those of patches of black and white cells in the automata that Mitchell's team studied.
General Motors, who were aspiring to put a cocklebur under Henry Ford's ambitious tractor tail, proceeded to buy out Messrs.
At the 1999 site, the major broadleaf weeds were common cocklebur (Xanthim strumarium L.
Both exogenous salicylic acid and the salicylic acid fraction of brown ambrosia aphid (Dactynotus ambrosiae) honeydew that had been feeding on cocklebur, Xanthium strumarium L.
Exogenous glutathione counteracted the effects of MSMA on the growth of susceptible cocklebur seedlings, callus, shoots and leaf discs.
The effects of individual variation in physiological and morphological traits on the reproductive capacity of the common cocklebur Xanthium strumarium L.