(1958)  Page(s) 242.  
 
In "Minor Forms of North American Species of Rosa," by Walter H. Lewis,
Rosa acicularis Lindl. subspecies Sayi (Schweinitz) f. plena
A form typical of Rosa acicularis Lindl. subspecies Sayi except that as many as fifteen petals occur in each flower. The form is known from only one locality, Moose Range, Saskatchewan.

(1958)  Page(s) 237, 241.  
 
p. 237: During the study of the North American rose species east of the Rocky Mountains, several unique and distinct forms have been observed. Variants include: individuals with more than five petals in each flower; specimens having unarmed floral stems where armature is typical; and those with glandular-hispid hypanthia and pedicels when the expression of these characters is normally eglandular [without glands]....Since transplant studies have shown that the forms are not expressions of environmental modification... it is felt that natural variations such as these should be given nomenclatural recognition at the rank of form.
p. 241: R. arkansana Porter f. plena A form typical of R. arkansansa except that as many as twenty petals are found in a single flower. The form is known only from one locality, Woodrow, Saskatchewan, and has been distributed by P. H. Wright. Individuals have been planted at the Blandy Experimental Farm...

(1958)  Page(s) 237, 242.  
 
Rosa carolina L. f. plena (Marshall) W.E. Lewis
p. 237: During the study of the North American rose species east of the Rocky Mountains, several unique and distinct forms have been observed. Variants include: individuals with more than five petals in each flower; specimens having unarmed floral stems where armature is typical; and those with glandular-hispid hypanthia and pedicels when the expression of these characters is normally eglandular [without glands]....Since transplant studies have shown that the forms are not expressions of environmental modification... it is felt that natural variations such as these should be given nomenclatural recognition at the rank of form.

p. 242: First described in the eighteenth century, the double petaled form of R. carolina has recently been nomenclaturally revised by Lynes (1955). In this study, the rare variation is reduced to forma status.