CIRSIUM

CIRSIUM

Cirsium is a genus of perennial flowering plants in the Asteraceae, one of several genera known popularly as thistles. They are mostly native to Eurasia and northern Africa, with three] species from North America.
They are known for their effusive flowered heads (usually purple, rose, yellow, or white). The radially symmetrical disk flowers are situated at the end of the branches. They have erect, prickly stems and leaves, with a characteristic focal point at the base of the flower which is particularly spiny. The leaves are alternate and can be slightly hairy; Their stem wings can be lacking, or inconspicuous. They can spread by seed and rhizome (Cirsium arvensis) or by seed alone. Their seed has tiny tufts of hair, which can carry them far by wind.
Most species are considered weeds, but some are cultivated in gardens for their aesthetic value. (wikipedia.org)
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