Website/Catalog  (2012)  
 
Website

Dr Helfferich, HT, pb, 1919, [Gustav Grunerwald × Mrs Aaron Ward], Lambert, P.; bud very large, ovoid, rose-orange; flowers rose, center yellowish-orange to rose pink, edged silvery, very large, dbl., cupped, borne singly or in small clusters, moderate, fruity fragrance; foliage medium size, glossy; growth upright

Book  (Apr 1999)  Page(s) 394.  
 
Dr. Helfferich Hybrid Tea. Lambert 1919. Parentage: 'Gustav Grünerwald' x 'Mrs. Aaron Ward'... rose, center yellowish orange, edges silvery...

Book  (Apr 1999)  Page(s) 556.  
 
Dr. Helfferich Hybrid Tea. Peter Lambert 1919

Website/Catalog  (1938)  Page(s) 24.  
 
Hybrid Teas. Dr. Helfferich (P. Lambert 19). Vigorous, Testout-character, large bud, ovoid, orange-pink, double, fragrant, deep pink on yellow base.

Book  (1936)  Page(s) 337.  
 
Helfferich, Dr. (HT) Lambert 1919; G. Grünerwald X Mrs. A. Ward; deep pink, center yellowish-orange, edges silvery, very large, semi-double, cup-form, solitary or up to 3, fragrance 7/10, floriferous with interruptions, long & strong stems, growth 6/10, upright. Sangerhausen

Book  (1920)  Page(s) 136.  
 
Dr. Helfferich, H.T. (Lambert, 1919.) Gustav Grünerwald X Mrs. Aaron Ward. Type, Mme. Caroline Testout. Bud very large, ovoid, rose-orange; flower very large, full, cupped, double and semi-double, borne singly and several together on long, strong stems; lasting; strong fragrance. Color rose, center yellowish orange, edges silvery. Foliage sufficient, medium size, glossy green; disease resistant. Vigorous grower of upright habit. reaching a height of 2 feet, and bearing an abundance of blooms intermittently. Hardy.