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Cirsium silvaticum Tausch 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 ).
Cirsium vulgare was ranked in the top ten for nectar production in a UK plants survey conducted by the AgriLand project supported by the UK Insect Pollinators Initiative. [7] Bull thistle was a top producer of nectar sugar in another study in Britain, ranked third with a production per floral unit of (2323 ± 418μg). [5]
Cirsium vulgare, for instance, ranked in the top 10 for nectar production in a UK plants survey conducted by the AgriLand project which is supported by the UK Insect Pollinators Initiative. Cirsium vulgare was also a top producer of nectar sugar in another study in Britain, ranked third with a production per floral unit of (2323 ± 418μg). [7]
The following species in the flowering plant genus Cirsium, the plume thistles, are accepted by Plants of the World Online. [1] A 2022 molecular study reassigned many species to other genera, but Cirsium remains a speciose genus. [ 2 ]
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Cirsium horridulum is a biennial herb up to 250 centimetres (100 in) tall, with a large taproot and fleshy side roots that sometimes sprout new shoots. Leaves are up to 40 centimetres (16 in) long with thick, sharp spines along the edges.
Cirsium arvense is a perennial species of flowering plant in the family Asteraceae, native throughout Europe and western Asia, northern Africa and widely introduced ...