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Cyperus   kyllingia  and  Cyperus   brevifolius  are problematic turfgrass weeds in Hawaii. Both are closely related weed species with similar morphology and growth characteristics.  C .  kyllingia  appears to be a more successful weed with regards to interference than  C .  brevifolius . Greenhouse experiments were conducted to compare the levels of interference exerted by  C .  kyllingia  and  C .  brevifolius  upon  Cynodon   dactylon  turfgrass.  C .  kyllingia  reduced the growth of  C .  dactylon  by about 50 %, while  C .  brevifolius  did not significantly reduce  C .  dactylon  growth. These results correspond with the chemical profiles of  C .  kyllingia  and  C .  brevifolius . Analysis has shown that  C .  kyllingia  contains two sesquiterpenes which have been identified as potentially allelopathic components of  Cyperus   rotundus .  C .  brevifolius  contains waxes and the two sesquiterpenes found in  C .  kyllingia  are absent. This suggests that allelopathy may be the mechanism responsible for the different levels of interference exhibited by  C .  kyllingia  and  C .  brevifolius , and these species may provide an important model for the study of allelopathy.

CYPERUS KYLLINGIA AND CYPERUS BREVIFOLIUS: A POTENTIAL MODEL FOR THE STUDY OF ALLELOPATHY