Book  (Apr 1999)  Page(s) 409.  
 
Intensity Hybrid Tea. Dingee & Conard 1908. Parentage: 'Gruss an Teplitz' x 'General MacArthur'... Deep red...

Book  (1936)  Page(s) 362.  
 
Intensity (HT) Dingee & Conard 1908; scarlet to vermilion-maroon-brown. large, double, solitary or up to 3, fragrance 5/10 (tea), floriferous, growth 6/10. Sangerhausen