Carduus tenuiflorus, known variously as slender-flower thistle, sheep thistle, shore thistle, slender thistle, winged plumeless thistle, winged slender thistle, and winged thistle) is a species of thistle.
Carduus tenuiflorus is native to western North Africa in: northern Algeria; Morocco; and Tunisia, and much of Europe in: Belgium; France, including Corsica; Ireland; Italy, including Sardinia and Sicily; the Netherlands; Portugal, Spain, including the Baleares (Balearic Islands); and the United Kingdom.
Carduus tenuiflorus may exceed 2 metres (6.6 ft) in height. Its tall stem is ridged with wings and has long spines which may be several centimeters in length. The dull olive-green leaves are lobed and wrinkled and may fold and crease themselves.
The inflorescences may hold up to 20 flower heads which are somewhat rounded, covered in wide, spiny phyllaries, and packed with pale pink to bright purple long-tubed disc florets. This is a tenacious weed of roadsides, fields, and disturbed areas.
- Carduus tenuiflorus was first described and published in Flora Londinensis 2(6): t. 55 (168,169). 1793. "Carduus tenuiflorus". Germplasm Resources Information Network (GRIN). Agricultural Research Service (ARS), United States Department of Agriculture (USDA). Retrieved January 23, 2012.
- Cal-IPC (California Invasisive Plant Council): Carduus tenuiflorus . accessed 4.8.2013
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