de Graaff 1921; 1925; 1938; Barr 1923; 1928; P. Henderson 1928; Pudor 1932; 1939; American Iris Society Bulletin 65: 37. May 1937 illustrated; Lawler 1938; Wayside 1938: Millikin 1939; Award of Merit Haarlem 1919; First Class Certificate 1925; Award of Merit Royal Horticulltural Society 1931; 9A 406; |
Scheepers 1936 catalog notes "THERESE VAN DUYLL SCHWARTZE: A very refined flower. Standards pale cornflower blue, falls pure white with narrow orange stripe. $.85 for 10; $6 per 100." |