Book  (2002)  Page(s) 84.  
 
R. carolina plena Species, medium pink, double. Not rated

Book  (Feb 1999)  Page(s) 11.  
 
R. carolina plena... a double rose with outer petals that whiten as they age...

Book  (Nov 1998)  Page(s) 11.  
 
R. carolina plena [similar to R. carolina except that] pink flowers are double rather than five-petaled...

Book  (Nov 1994)  Page(s) 96.  Includes photo(s).
 
R. carolina 'Plena' - GST describes how the Lynes of Taberg, NY, rediscovered this rose and sent him plants; synonyms include Rosa pennsylvania var. flore pleno and Rosa parviflora var.flore multiplici of Redouté; and Rosa carolina, A Lawrance.

Magazine  (1982)  Page(s) 1. Vol 4, No. 1.  
 
Editor [?]  Roses Imported From New Zealand.
This year some 'new' old roses have been imported from Trevor Griffiths in New Zealand, among those that arrived in January were: 
Rosa carolina plena -loosely double and a pleasant shade of pink this shrub will allow even more choice to those seeking variety and hardiness in their bush roses. 

Book  (1981)  Page(s) 268.  
 
R. carolina...'Plena'. Shrub to 0.5 m./1.7 ft. high, densely bristled, stems slender, with suckers; leaflets small, narrow, acute, serrate; flowers clear salmon-pink, center slightly darker, finally nearly white, very double; sepals very long and narrow, glandular-hairy like calyx and pedicels; prickles in pairs below nodes. (= R. pennsylvanica Marsh.).

Book  (1976)  Page(s) 103.  
 
R. carolina 'Plena' (Marsh.) Doris Lynes (R. pensylvanica Marsh.) - Double blooms.

Book  (1966)  Page(s) 207.  
 
The oldest cemetery in Auckland, where New Zealand's first Governor, Captain William Hobson, was buried in 1842, lies along the side of Grafton Gully. Many old roses, some of historic significance; are to be found in this area; amongst them is the only bush of a wild American rose we have found, either in an old garden, or an early cemetery, though a number are now grown in Botanical Gardens and in newer private ones. According to American authorities this delightful rose is R. carolina plena. This Pasture Rose, its single form, grows from New Brunswick down to Florida and as far west as Texas and Wisconsin; it is also the state flower of Iowa. As we were not sure at first of the name of our cemetery rose, we made a note to check up on it in Europe. We took our colour slides with us; but neither in Italy, France, nor England did we find it. While in London we studied a copy of H. C. Andrew's Roses, at the Royal Horticultural Society's Library and this helped us considerably. In it were three delightful coloured reproductions of the bloom of R. carolina plena in different stages of development. As soon as we saw these illustrations we felt fairly certain that we had at last identified our rose. The double, soft pink, fragrant flowers open in a distinctive manner; some of the central petals remaining tightly folded like the bud-rather reminiscent of the blooms of the old pink camellia, Lady St Clair. Others open wide, showing the yellow stamens. These characteristics were most noticeable in the fine paintings of Andrew's valuable book. Mr Graham Thomas advised us to send slides of the rose to an American expert, Mr Wilson Lynes, in order to check up on it more fully; so we took a comprehensive set of colour slides on our return, and posted them off to the United States along with a page of pressed specimens. Mr Lynes was most interested, particularly when he heard it had been planted on a grave in New Zealand in 1881; and he was able to confirm our identification. This American authority has recently published an interesting brochure which proves that R. rapa, so long believed to have been a double form of R. virginiana was, in fact, R. carolina plena. Apparently, this double form of carolina is now quite rare, even in its native haunts; and this is borne out by the fact that Richard Thomson, in his book Old Roses for Modern Gardens, calls R. carolina his pet amongst the wild roses, but does not mention the double form. The late Mr Will Tillotson of California, who was an old-rose grower and enthusiast, considered the single form of the Pasture Rose the most interesting plant in Mr Thomson's collection. Both these authorities confirm that it hybridises freely with other American species; and that many varieties are to be found. In 1955 Mr and Mrs Wilson Lynes rediscovered R. carolina plena on an early farm in New York State. It was growing in a tangle of lilac and snowberry; only the shrubs, Gallica Roses, and this lovely wild American rose marking the site of an old homestead. The same thing occurs in New Zealand, where valuable and rare roses are often discovered in overgrown and neglected gardens, and round early settlements. How this double rose first came to New Zealand from the United States, and how the only bush of it we have seen out here should be growing in this early cemetery, is quite a mystery. So far we have not been able to find out anything concerning its arrival in the country. This bush is growing side by side with Adelaide d'Orleans, that delightful trailing cluster rose with creamy pink flowers, the blooms of which tone so well with the warm pink blooms of R. carolina plena. These two make an attractive picture in the old cemetery. It was a thrill when we were able to add this enchanting rose to our own collection of American species.

Article (misc)  (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.

Book  (1955)  Page(s) 19-24.  Includes photo(s).
 
A Rediscovery of the Double Form of Rosa carolina by Doris and Wilson Lynes, included in full under Comments & Questions, describes the historical background of the documentation of this species rose.