Book  (Dec 1998)  Page(s) 323.  Includes photo(s).
 
Jazz Cluster-flowered/Floribunda. de Ruiter (The Netherlands) 1960. Parentage: 'Masquerade' x Seedling... double, medium-sized, orange-yellow flowers with a pink-crimson blushing over the whole bloom...

Book  (Apr 1993)  Page(s) 267.  
 
Jazz Floribunda, flowers orange-yellow flushed crimson, 1960, 'Masquerade' x Seedling; deRuiter; Gregory...

Book  (1962)  Page(s) 160.  
 

Trial Ground Awards 1961
Trial Ground Certificate to Jazz  (Flori.). Trial Ground No. 1898. Reg.  No. 622. Raiser: G. de Ruiter, Holland. Distributor: C. Gregory & Son, Ltd.,   Nottingham. 'Masquerade'  x 'Amor'. Vigour  of growth,   9. Habit of growth strong and branching  with plentiful dark green foliage, 9. Freedom from  disease, 14. Blooms  rosette shaped  (48 small petals), 2 1/2 inches across when open, 7. Colour cherry-red with yellow  reverse, 6. Freedom of flowering, 16. General effect, 5. Fragrance, 4.