ADRIAN BICKER / SCIENCE PHOTO LIBRARY ADRIAN BICKER / SCIENCE PHOTO LIBRARY
Knapweed Broomrape (Orobanche elatior) flower growing in the centre of a clump of Greater Knapweed. Broomrapes are totally parasitic, in this case, drawing all nutrients from the roots of Greater Knapweed and the only indication of this on the plant, is the appearance of flower spikes. These have no chlorophyll and the leaves are rudimentary.
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