Book  (Jan 2000)  Page(s) 184.  
 
Helen Herbaceous Peony. Thurlow 1922. A single pink lactiflora

Website/Catalog  (1960)  Page(s) 10.  
 
Pink Single Peonies
Helen (Thurlow 1922) Early single, with two rows of broad shell pink petals. Blooms freely. This is a very attractive variety, and is grand for landscape effect. $1.50