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Cirsium crassicaule
''Cirsium crassicaule'' is a species of thistle known by the common name slough thistle. It is endemic to the San Joaquin Valley of California, where it is known primarily from freshwater wetlands. It has been found in only a few locations in Kern, Kings, and San Joaquin Counties.〔(Biota of North America Program 2014 county distribution map )〕〔(Calflora taxon report, University of California, ''Cirsium crassicaule'' (E. Greene) Jepson, slough thistle )〕
''Cirsium crassicaule'' is an annual or biennial herb known to reach 300 cm (10 feet) in height. The thick stem is hollow and may be nearly 10 centimeters (4 inches) wide at the base. It is coated in hairs and cobwebby fibers. The woolly, webby, spiny leaves are deeply cut into many lobes, the lobes often lined with teeth. The longest leaves near the base of the plant may be 70 centimeters (28 inches) long.〔
The inflorescence is a cluster of several flower heads each up to 3 centimeters long by 3 wide. The head is lined with spiny phyllaries and filled with pale pink or occasionally white flowers. The fruit is an achene with a flat, dark brown body about 5 millimeters long and topped with a pappus which may be 2 centimeters in length.〔(Flora of North America, ''Cirsium crassicaule'' )〕〔(Greene, Edward Lee 1893. Proceedings of the Academy of Natural Sciences of Philadelphia 44(3): 357–358 ) as ''Carduus crassicaulis''〕
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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