Book  (Jan 2000)  Page(s) 240.  
 
Yellow Emperor ITOH (Intersectional) Hybrid. Itoh-Smirnow 1974. A cross between tree peony 'Alice Harding' and 'Kakoden'. A semi-double yellow

Book  (Jan 1999)  Page(s) 63.  
 
In the 1960s Toichi Itoh crossed the low-growing tree peony 'Alice Harding', a hybrid of P. lutea with the lactiflora 'Kakoden'. Sadly he did not live to see the seedlings flower. Four of them, 'Yellow Emperor', 'Yellow Crown', 'Yellow Dream' and 'Yellow Heaven' have since been produced commercially and caused great excitement. Yugen Higuchi has carried on the work in Japan, and the American Peony Society has now declared the new category valid under the name 'Itoh hybrids'.