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Flower heads will droop to a 90-degree angle from the stem when mature, hence its alternate name, nodding thistle. Each plant may produce thousands of straw-colored seeds adorned with plume-like bristles.
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www.nps.gov/plants/alien/fact/canu1.htm
www.nps.gov/plants/alien/fact/canu1.htm
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Natural communities that are threatened by Canada thistle include non-forested plant communities such as prairies, barrens, savannas, glades, sand dunes, fields and meadows that have been impacted by disturbance.
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www.nps.gov/plants/alien/fact/ciar1.htm
www.nps.gov/plants/alien/fact/ciar1.htm
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Britannica online encyclopedia article on thistle (plant), weedy species of Cirsium, Carduus, Echinops, Sonchus, and other plant genera of the family Asteraceae. The word thistle most often refers to prickly leaved species of Carduus and Cirsium, which have dense heads of small, usually pink or purple flowers.
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www.britannica.com/EBchecked/topic/592707/thistle
www.britannica.com/EBchecked/topic/592707/thistle
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Britannica online encyclopedia article on globe thistle (plant), ...agricultural areas of North America, and more than 10 species of sow thistle (Sonchus) are widespread throughout Europe. Some species of globe thistle (Echinops) are cultivated as ornamentals. ... ornamental use (in thistle (plant))
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www.britannica.com/eb/topic-235442/globe-thistle
www.britannica.com/eb/topic-235442/globe-thistle
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www.turf.uiuc.edu/weed_web/canadathistle/canadathistle_...
www.turf.uiuc.edu/weed_web/canadathistle/canadathistle_m.htm
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Plant Description: ... Most milk thistle products are standardized preparations made from the seeds of the plant. Most preparations are standardized to contain 70 - 80% of silymarin...
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www.umm.edu/altmed/articles/milk-thistle-000266.htm
www.umm.edu/altmed/articles/milk-thistle-000266.htm
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Musk thistle is a prolific seed producer. One plant can set up to 20,000 seeds. However, only one-third of the seeds are viable. Musk thistle produces many heads. The terminal, or tallest, shoots flower first, then lateral shoots develop in leaf axils.
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www.ext.colostate.edu/PUBS/NATRES/03102.html
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AllRefer.com reference and encyclopedia resource provides complete information on thistle, Plants. Includes related research links. ... thistle, popular name for many spiny and usually weedy plants, but especially applied to members of the family Asteraceae (aster family) that have spiny leaves and often showy heads of...
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reference.allrefer.com/encyclopedia/T/thistle.html
reference.allrefer.com/encyclopedia/T/thistle.html
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perennial and biennial thistles and their control in cropland, pastures, rangeland and other lands ... The average musk thistle plant produces in excess of 10,000 seeds per plant and under favorable conditions may produce 120,000 seeds per plant. Seed germination generally averages 30 percent.
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www.ag.ndsu.edu/pubs/plantsci/weeds/w799w.htm
www.ag.ndsu.edu/pubs/plantsci/weeds/w799w.htm
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