Book  (Jan 2000)  Page(s) 75.  
 
Festiva Maxima Herbaceous Peony. Miellez 1851. The most popular old white... with crimson flecks...

Book  (Jan 1999)  Page(s) 632.  
 
P. lactiflora 'Festiva Mexima' frilled petals... white with red flecks

Website / Catalog  (1861)  Page(s) 59.  
 
Paeonia Herbacea.
10. Festiva maxima. (Miell.).