Book  (Apr 1993)  Page(s) 261-262.  
 
Iroquois Shrub, mauve-pink, 1932, 'Pythagoras' x R. cinnamomea; Central Exp. Farm...

Book  (Jan 1946)  Page(s) 33.  
 
Iroquois. C.E.F. Ottawa. R. cinnamomea x spinosissima var. Pythagoras. A larger bush than Huron. The colour of the flowers is deep mauvish-pink and not particularly attractive but as deep coloured flowers are rare in roses of this class it has a place.

Book  (1946)  Page(s) 52-3.  
 
In "Progress in Breeding Hardy Roses," Isabella Preston says,

Huron and a sister seedling, Iroquois, are similar except in color. They sucker freely and grow about three feet tall. The foliage is healthy and hangs on until severe frost. The flowers are semi-double. In Huron, they are white except for a faint blush on first opening and are quite attractive. In Iroquois, the color, Pale Amaranth Pink, is not particularly pleasing but it is worth growing in cold regions where the choice of roses with semi-double flowers that survive the winters is limited.

Book  (1940)  Page(s) 92.  
 
In "Central Canadian Rose-Breeding" Isabella Preston says,

R. cinnamomea was crossed with a Scotch rose named Pythagoras, and two seedlings have been named: Huron (R.23.08.01) has semi-double white faintly flushed flowers; Iroquois (R.23.08.02) has semi-double pale amaranth-pink flowers.

Book  (1936)  Page(s) 363.  
 
Iroquois (? hybrid) Miss Preston 1933; ?