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Carduus pycnocephalus plant4 ST : 無料・フリー素材/写真

Carduus pycnocephalus plant4 ST / Macleay Grass Man
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Carduus pycnocephalus plant4 ST

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ライセンスクリエイティブ・コモンズ 表示 2.1
説明Introduced, cool season, annual or biennial, erect herb usually 0.6-1 m tall. Leaves form rosettes when young; they are lobed, spiny & slightly woolly below; rosette leaves may have white patches. Stems are slightly woolly or cobwebby & have spiny discontinuous wings along their length. Heads are cylindrical, solitary or in clusters of 2-3 and occur on short peduncles. Florets are tubular and pinkish-purple. Germinates in autumn & flowering is in spring. Mostly occurs in areas with more than 500 mm rainfall on soils of moderate to high fertility (e.g. stock camps, rabbit diggings, etc.). Establishes readily in bare, disturbed patches in paddocks, roadsides, waste ground & around cultivated areas. Seeds are spread by wind or by animals. Competitive with pastures & is avoided by stock due to spines. Can contaminate wool & cause mechanical injury to stock & farm dogs. Potentially toxic to stock due to nitrate levels. Dense pasture cover at the end of summer will inhibit germination. Slashing close to flowering can reduce seed set, but results are inconsistent. Grazing with goats can also reduce seed set. Effective control in pastures can be achieved by boom spraying small plants; spray-grazing at the rosette stage and chipping or spot spraying isolated plants.
撮影日2014-10-10 09:07:27
撮影者Macleay Grass Man , Dungog, Australia
タグ
撮影地
カメラCanon PowerShot A650 IS , Canon
露出0.002 sec (1/500)
開放F値f/3.5
焦点距離13745.70455 dpi


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