( Paul Cook
, R. 1948) TB. Midseason bloom. Color Class-R1M. Parentage not given. Honorable Mention 1950.
| From Longfield Iris Farms catalog, 1949: RELENTLESS (Cook, 1948). A new iris that is a solid deep red with color pure and rich throughout the whole flower, even extending over the hafts; beard cadmium yellow. The flowers are medium large in size with excellent substance and texture. Color does not fade or spot in sun or rain. Mid season-late. 38 inches. Relentless shows more richness and brilliance than any other Iris in this color group. Exceptionally fine. $12.50.
| From Fleur de Lis Gardens catalog 1956: RELENTLESS (Cook 1948) M. L. 34 in. (From red line breeding). A solid red self, slightly on the maroon side. Rounded form, heavy substance and medium sized flowers. H. M. 1950. 1.00.
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