Alan Williams / Hoverfly (Sericomyia silentis) on Knapweed (Centaurea nigra) flower in meadow Cheshire, UK, September.
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Will Watson / Vestal cuckoo bumblebee (Bombus vestalis) feeding on Knapweed (Centaurea nigra), Herefordshire, England, UK, June.
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Will Watson / Common carder bee (Bombus pascuorum) male on Knapweed (Centaurea nigra), Worcestershire, England, UK, August.
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Rod Williams / Black / Lesser knapweed (Centaurea nigra) flowers, Sutcliffe Park Nature Reserve, Eltham, London, England, June.
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Alan Williams / Hoverfly (Sericomyia superbens) feeding on Knapweed (Centaurea nigra) at forest edge, North Wales, UK, September.
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Alan Williams / Hoverfly (Sericomyia silentis) feeding on Knapweed (Centaurea nigra) fllower on roadside verge, North Wales, UK, August.
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Alan Williams / Hoverfly (Sericomyia superbens) feeding on Knapweed (Centaurea nigra) at forest edge, North Wales, UK, September.
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Alan Williams / Small skipper (Thymelicus sylvestris) feeding on Knapweed (Centaurea nigra) in meadow. Cheshire, UK, August.
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Rod Williams / Common Knapweed (Centaurea nigra) Ladywell Fields, Lewisham, South East London, England, UK, July
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Alex Hyde / Common / Black Knapweed (Centaurea nigra) Peak District National Park, Derbyshire, UK. August.
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Alex Hyde / Common / Black Knapweed (Centaurea nigra) growing in disused limestone quarry. Peak District National Park, Derbyshire, UK. August.
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Ernie Janes / RF- Ox-eye Daisies (Leucantemum vulgare) and Common Knapweed (Centaurea nigra) in hay meadow, Wensum Valley, Norfolk, UK. July. (This image may be licensed either as rights managed or royalty free.)
