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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.
The flowers are usually dioecious, but not invariably so, with some plants bearing hermaphrodite flowers. [20] The seeds are 4–5 mm long, with a feathery pappus which assists in wind dispersal. [ 26 ] [ 27 ] [ 28 ] One to 5 flower heads occur per branch, with plants in very favourable conditions producing up to 100 heads per shoot. [ 14 ]
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]
Cirsium erisithales can reach a height of 50–150 millimetres (2.0–5.9 in). The stems are erect, almost hairless. This plant has just a few leaves, with tooth-shaped lobes. Flower heads are lemon yellow, solitary or in groups (up to 5), with a diameter of 25–30 millimetres (0.98–1.18 in). [4]
Cirsium horridulum, called bristly thistle, purple thistle, or yellow thistle is a North American species of plants in the tribe Cardueae within the family Asteraceae. It is an annual or biennial . [ 2 ]
These unusual flowers carry a patriotic meaning, proving that pride can come in many shapes and colors. It can also represent conquest, perhaps because of its assertive celebratory color and ...
Cirsium eriophorum, the woolly thistle, [2] is a herbaceous biennial species of flowering plant in the genus Cirsium of the family Asteraceae. It is widespread across much of Europe. It is a large biennial plant with sharp spines on the tips of the leaves, and long, woolly hairs on much of the foliage.
The language of flowers is a mystery to many. While there's a good chance you already know what roses symbolize (love, of course), you may be surprised to know the meaning behind some of your ...