Book  (Apr 1993)  Page(s) 619.  
 
U.P. Hedrick Hybrid Spinosissima (Old Garden Rose), flowers pink, 1932, R. spinosissima altaica x 'Betty Bland' (probably); Central Exp. Farm...

Magazine  (1960)  Page(s) 23.  
 
U.P. Hedrick C.E.F. Ottawa. An open-fertilized seedling of R. Spinosissima altaica. A vigorous bush with abundant dark green foliage. The stems are reddish brown and the plant has some resemblance to R. blanda. The flowers are single, large, and pink.

Book  (Jan 1946)  Page(s) 34.  
 
U. P. Hedrick. C.E.F. Ottawa. An open fertilized seedling of R. spinosissima altaica. A vigorous bush with abundant dark green foliage. The stems are reddish-brown and the plant has some resemblance to R. blanda. The flowers are single, large and pink.

Book  (1946)  Page(s) 53.  
 
In "Progress in Breeding Hardy Roses," Isabella Preston says,

U. P. Hedrick is an open-pollinated seedling of R. spinosissima var. altaica with single Rosaline Pink flowers. The parent bush was growing near some plants of Betty Bland, a hybrid that Mr. F. L. Skinner raised, using R. blanda as a parent. The seedling shows several characteristics of R. blanda and grows into a light, graceful bush about six feet tall which is covered with bloom for about two weeks in June. On October 15, the foliage showed no disease and its delicate autumn tints made an attractive spot in the shrubbery border." It is named in honor of Professor Hedrick of Geneva, New York.

Book  (1940)  
 
In "Central Canadian Rose-Breeding," Isabella Preston says,

U. P. Hedrick (R.26.08.01) is an open-fertilized seedling of R. spinosissima altaica, with single rosaline-pink flowers. This plant is sometimes damaged in the winter.

Book  (1936)  Page(s) 335.  
 
Hedrick. I. P. (? hybrid) Miss Preston 1933; ?