Book  (11 Jun 1993)  Page(s) 16.  
 
('Dart's Defender', R. nitida 'Defender') R. nitida x 'Hansa'. Darthius Nursery (Holland) 1971. Description. Violet-pink single blossoms...

Book  (1981)  Page(s) 269.  
 
'Dart's Defender' (Darth. Boomkw. 1971). (= R. nitida X R. rugosa hansa). Growth stronger than R. nitida; flowers violet-pink (= R. nitida superba Darth Boomkw.)