Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Carduus is a genus of about 90 species of thistles in the family Asteraceae, native to Europe, Asia and Africa. Carduus is Latin for a thistle. Carduus thistles are used as food plants by the caterpillars of some Lepidoptera species, including the Thistle Ermine (Myelois circumvoluta) and the case-bearer Coleophora therinella. The Asteraceae or Compositae, also referred to as the aster, daisy, or sunflower family, is the largest family of vascular plants. The family has more than 22,750 currently accepted species, spread across 1620 genera, and 12 subfamilies. The largest genera are Senecio (1,500 species), Vernonia (1,000 species), Cousinia (600 species) and Centaurea (600 species). Most members of the Asteraceae are herbaceous, but a significant number are also shrubs, vines and trees.

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