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Typically, an involucre with a clasping shape similar to a cup or urn subtends each of a thistle's flower heads. The typically feathery pappus of a ripe thistle flower is known as thistle-down. [1] The spininess varies considerably by species. For example, Cirsium heterophyllum has very soft spines while Cirsium spinosissimum is the opposite. [2]
Rhodomyrtus tomentosa is an evergreen shrub growing up to 4 m (12 feet) tall. The leaves are opposite, leathery, 5–7 cm long and 2–3.5 cm broad, three-veined from the base, oval, obtuse to sharp pointed at the tip, glossy green above, densely grey or rarely yellowish-hairy beneath, with a wide petiole and an entire margin.
The Cardueae are a tribe of flowering plants in the daisy family and the subfamily Carduoideae. [5] Most of them are commonly known as thistles; [6] four of the best known genera are Carduus, [7] Cynara (containing the widely eaten artichoke), Cirsium, [7] and Onopordum.
Cirsium erisithales, the yellow thistle [2] or yellow melancholy thistle, is a perennial herbaceous plant in the tribe Cardueae within the family Asteraceae. [ 3 ] Description
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.
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 pycnocephalus, with common names including Italian thistle, Italian plumeless thistle, and Plymouth thistle, [1] is a species of thistle. It is native to the Mediterranean region in southern Europe, North Africa , and Western Asia ; Eastern Europe and the Caucasus ; and the Indian Subcontinent .
Cirsium vulgare (spear thistle) is listed in the United States (where as a non-native invasive species it has been renamed "bull thistle") as a noxious weed in nine states. [6] Some species in particular are cultivated in gardens and wildflower plantings for their aesthetic value and/or to support pollinators such as bees and butterflies.