Original text - Engels - .Far from being opportunistic weeds, cropping up...

.Far from being opportunistic weeds, cropping up wherever ploughed land exists, increasingly, the
complexity of arable plant communities is being recognised. For example, no fewer than 48
different arable communities have been identified, reflecting subtle variations in soil, aspect and
climate, whilst many rarer arable plant species show a high fidelity to certain historic areas.