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The weevil Larinus planus also feeds on the thistle and has been used as a control agent in Canada. [43] One larva of the species can consume up to 95% of seeds in a particular flower bud. [ 44 ] However, use of this weevil has had a damaging effect on other thistle species as well, include some that are threatened. [ 45 ]
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.
Cirsium vulgare, the spear thistle, bull thistle, or common thistle, is a species of the Asteraceae genus Cirsium, native throughout most of Europe (north to 66°N, locally 68°N), Western Asia (east to the Yenisei Valley), and northwestern Africa (Atlas Mountains).
Milk thistle flowerhead Cirsium arizonicum, showing arachnoid cobwebbiness on stems and leaves, with ants attending aphids that might be taking advantage of the shelter. Thistle is the common name of a group of flowering plants characterized by leaves with sharp spikes on the margins, mostly in the family Asteraceae. Prickles can also occur all ...
Annual sow thistle – Sonchus oleraceus; California thistle – Cirsium arvense; Canada thistle – Cirsium arvense; Corn thistle – Cirsium arvense; Corn sow thistle – Sonchus arvensis; Creeping thistle – Cirsium arvense; Cursed thistle – Cirsium arvense; Field sow thistle – Sonchus arvensis; Green thistle – Cirsium arvense
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Cirsium arvense†‡ [2] – creeping thistle, Canada thistle, field thistle; Cirsium barnebyi – Barneby's thistle; Cirsium eatonii – Eaton's thistle, mountaintop thistle; Cirsium rydbergii – alcove thistle, Rydberg's thistle; Crepis modocensis – Modoc hawksbeard; Encelia nutans – noddinghead, nodding sunray
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 ]