Cenchrus setigerus is a polymorphic species comprising four chromosomal forms viz.,2n=34,36 37 and 54(Darlington and Wylie,1955 :Patilet al.1961 :Jagannath,1963).The 54-chromosome form is distinct from the rest in being more vigorous.taller,highly tillering with dense setting of spikelets on thick,long peduncles.Meiosis iss characterise by multivalent associations and aber - rations of chromosomal behaviour usually associated with apomicts.A cytological study of accessions which appeared to be on morphological grounds hexaploids.has confirmed their hexaploid status.plants resulting from the cross of C.setigerus(2n :54)xPennisetum squamulatum (2n : 54)as well as in selfed progenies,haploid plants were detected.The morphological characte- ristics and cytological behaviour of these polyhaploids are presented below :
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