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Carduus nutans is a monocarpic herb and is classified as a biennial thistle, though it can have varying phenology depending on climate and habitat. [5] Mature plants can reach 2.7 m (9 ft) in height with multi-branched stems.
Carduus is a genus of flowering plants in the family Asteraceae, and the tribe Cardueae, one of two genera considered to be true thistles, the other being Cirsium. [2] Plants of the genus are known commonly as plumeless thistles .
Christian Friedrich Lessing published Cynareae in 1830, but Henri Cassini had already published Cardueae in 1819, and as Lessing included Carduus in Cynareae, his name was superfluous. [4] [2] Some authors have divided the plants traditionally held to be in this tribe into three tribes: Cynareae in the narrow sense, Carlineae, and Echinopeae.
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Already as a result of the genetic study Ackerfield et al. 2020, Cirsium and Carduus were determined to be polyphyletic in their current circumscriptions, suggesting to either "consolidate all taxa into one large genus (Carduus or Cirsium)," or "recognize each major clade as a genus (Carduus, Cirsium, Eriolepis, Notobasis, Picnomon, Silybum ...
Carduus argentatus, sometimes known as the silver thistle, is an annual herb in the family Asteraceae. As a member of the genus Carduus it is known as a plumeless thistle. [1] It is found throughout the Mediterranean and Middle East. Frequently growing in disturbed habitats, it is often found in sandy and stony desert wadis.
Carduus acanthoides, known as the spiny plumeless thistle, welted thistle, or plumeless thistle, is a biennial plant species of thistle in the family Asteraceae. The plant is native to Europe and Asia and introduced in many other areas, where it is sometimes considered an invasive species .
Cirsium undulatum is a species of thistle known by the common names wavyleaf thistle and gray thistle. [2] It is native to much of central and western North America from British Columbia east to Manitoba and south as far as the State of Durango in Mexico.