Book  (1849)  Page(s) 499.  
 
P. Moutan...Following newer, magnificent varieties are available in Belgian nurseries:...Fürst Metternich...
...These varieties can mostly be had at Mr. van Houtte in Gent.

Website/Catalog  (1846)  Page(s) 42.  
 
Pivoines en arbre. (Pæonia Moutan.)
Pæonia Fursten Metternich...

Book  (1846)  Page(s) 471.  
 
Moutan Sims, varieties and hybrids.....Fürstin Metternich v. Houtte.....