Book  (1958)  Page(s) 292.  
 
Perfecta. Pol. (Spek, '20.) Ellen Poulsen X Merveille des Rouges. Large, dbl., scarlet-crimson under glass, dark crimson in the open; cluster. Vig.

Magazine  (Jun 1948)  Page(s) 2. trimester, p. 24.  
 
Hybrides de Polyanthas derivés des Wichuras....
Perfecta, Merveille des rouges X Ellen Poulsen; Grande, double cramoisi écarlate, corymbes

Book  (1936)  Page(s) 553.  
 
Perfecta (polyantha) Spek 1920; Ellen Poulsen X Merv. des Rouges; dark crimson or scarlet-crimson, large, double, open, lasting, cluster-flowered, fragrance 3/10, floriferous, continuous bloom, growth 6/10, bushy, short.

Book  (1921)  Page(s) 165.  
 
Perfecta, D.Poly. (Jan Spek, 1920.) Ellen Poulsen X Merveille des Rouges. Type, Erna Teschendorf!, but more vigorous. Bud globular; flower large, full, double, open, globular, scarlet-crimson under glass (dark crimson in the open), very lasting, borne in clusters on long, strong stem; slightly fragrant. Foliage abundant, medium size, glossy, dark green. Vigorous; bushy; blooms very freely all season. Hardy.