Book  (Jan 1999)  Page(s) 324.  
 
P. x smouthii Herbaceous Peony... crimson

Website/Catalog  (1910)  Page(s) 39.  
 
European herbaceous peony varieties.
Paeonia Smoothi. Single, glossy cherry-red with golden stamens. 1 piece M 0.90, 10 pieces M 8.-

Book  (1907)  Page(s) 3.  
 
Peonia Anomala, Linn. ..... Its varieties, Insignis, Peter Barr, Smoutti and Intermedia are now recognized, being
more distinct in the character of foliage than otherwise.
 

Book  (1849)  Page(s) 499.  
 
P. tenuifolia...Varieties:...Smoutii.
...to be had at Mr. van Houtte.

Book  (1846)  Page(s) 471.  
 
tenuifolia L., Var. and hybrids: ....Smouthii v. Houtte.....