(1979)  Page(s) 85.  
 
......tighter and compact flowered mutants of 'Montezuma' were lost during the floods of 1971. The reddish orange mutant of 'Montezuma' which survived was multiplied and has been released as a new cultivar under the name 'Angara' as described below:
'Angara': Gamma ray induced mutant of 'Montezuma', very vigorous, compact and profuse blooming. Darker reddish orange in colour. Flowers large (8-10 cm), semi-double (15-20 petals), open and slightly more fragrant than the parent; foliage...