RMK70ABK–Giant knapweed (Centaurea macrocephala), a large summer flowering perennial, blooming in an English garden
RFBN58H6–Blue flowers of a perennial knapweed (Centaurea montana)
RMW7T241–Hoverfly (Eristalis intricarius) female feeding on Greater knapweed flower (Centaurea scabiosa) in chalk grassland meadow with stand of Wild marjoram (Origanum vulgare) in the background, Wiltshire, UK, July.
RMF640J7–Autumn flower of the compact, late blooming knapweed, Serratula seoanei
RMW4040K–Common Knapweed flowers in bloom with pollinating hoverfly in grassland meadow, Oxfordshire, UK
RM2GRE0KM–Bumblebee on Greater Knapweed
RF2JM1872–Six-spot Burnet Moth (Zygaena filipendulae) on knapweed in the Kent Downs AONB, England, UK
RMGGK9G0–Knapweed Broomrape - Orobanche elatior
RM2D7H9XB–snout moth (Oncocera semirubella), on a knapweed flower, Germany, Bavaria
RMDR9TAE–Common Knapweed flowers
RMK70ABD–Giant knapweed (Centaurea macrocephala), a large summer flowering perennial, blooming in an English garden
RFB1W6FD–Blue flowers of a perennial knapweed Centaurea montana
RME57PM6–split knapweed, centaurea salonitana
RMKFB841–Dew covered flowers of the late blooming dwarf knapweed, Serratula seoanei
RMC13308–Flower of Common Knapweed (Centaurea nigra) against the setting sun. Powys, Wales
RM2DF6APE–Singleflower knapweed (Centaurea uniflora) is an alpine plant native to Mountains of central and southeast Europe, from Switzerland to Romania.
RFAC2PRJ–Flower and buds of Greater knapweed (Centaurea scabiosa)
RMJRARCA–Common Knapweed a.k.a. Black Knapweed Centaurea nigra