Book  (1898)  Page(s) 218.  
 
[George Hibbert] is stated to have introduced following Chinese plants:...In 1795, Paeonia Moutan rosea plena. Bot. Cab. t. 1035 (1825). Sabine, on Paeonia Moutan, 1826, Trans. Hort. Soc. VI, 477.

Magazine  (22 Jan 1887)  Page(s) 77.  
 
The Tree Pæony. 
...The above varieties, viz., Banksi, rosea, and papaveracea, are all that are described in Anderson's "Monograph of the Genus Pæonia", given in vol. vi. of the Horticultural Society's Transactions (1838), but in Loudon's "Arboretum Britannicum" (1854) a dozen are described, all bearing Latin names.  There are, besides the three just named, Humei, double blush; variegata, white streaked with violet and purple; rosea semi-plena, rosea plena, Rawesi, single pale pink; carnea plena, double flesh coloured; albida plena, double white, flushed with mauve; Anneslei, small single purplish pink; and lacera with the petals curiously cut into strips.  These nine varieties had probably all been raised from seed obtained from Banksi, rosea, and papaveracea, for at that time the Earl of Mountmorris, at Arley, and the Earl of Sandwich, at Hinchingbrooke, both took a great interest in the Tree Pæony, and raised several distinct sorts chiefly from the single papaveracea.

Book  (1854)  Page(s) 5.  
 
P. moutan rosea flore pleno odorante, 1850.

Book  (1838)  Page(s) 251, vol.1.  
 
Pæonia Mou'tan Sims.  The Moutan, or Tree, Peony.
Specific Characters.  Segments of leaves oval-oblong, glaucous underneath.  Carpels 5, villose.  (Don's Mill., i. p.65) Height 10 ft.
Varieties and their Distinctions.
7. P. Moutan ròsea plèna  Hort. Trans.  The double rosy-flowered Moutan Peony. — Flowers very double, of a fine deep pink, nearly scentless.  Petals jagged.  (Don's Mill., i. p.65.)  Introduced from China in 1804.  It flowers from April to June. (Hort. Brit.)
Identification.  Hort. Trans., 6. p.477.
Synonymes.  P. suffruticòsa Andr. Bot. Rep.
Engravings. Andr. Bot. Rep., t. 373.; Bonpl. Pl. Rar., t. 23.

Book  (1838)  Page(s) 37.  
 
Paeonia Moutan (Var. Rosea Plena) Chinese Peony. Rose-coloured double variety...Paeonia Moutan. Sims' Bot. Mag. t. 1154.
This is one of the varieties of the species Moutan, introduced about the year 1794, and certainly a very splendid one. It was sent to W.H. Osborn, Esq. of Perry, near Birmingham, from the valuable and extensive collection of Earl Mountnorris...All the Moutans are hardy shrubs, which in a conservatory expand their blossoms in April and continue in bloom until the middle of May....[Peonies] appear to have been introduced into this country about fifty years ago. ..It is a native of China, and, according to the Missionaries' account, published at Paris in the year 1728, it is one of the most cherished plants of the Chinese. They are said to have cultivated it for upwards of 1400 years, and to have varieties to the number of 300, embracing all colours, even black! The generic name is derived from Paeon, a physician, who first employed one of the species in medicine; and who is said, according to the Greek legend, to have used it to cure Pluto of a would inflicted by Hercules.

Magazine  (1826)  Page(s) 477-479.  
 
[From "On the Paeonia Moutan, or Tree Peony, and its varieties". By Joseph Sabine, Esq. F.R.S. &c. &c. Secretary. Read June 6, 1826, p. 465-492]

5. Paeonia Moutan Rosea Plena. A sub-variety of the preceding, producing very double flowers, with similar foliage, has come under my observation. Plants of it are in the garden of the Horticultural Society, which were obtained from Mr. Richard Williams, of Turnham Green, who purchased the parent stock at the sale of the plants of George Hibbert, Esq. of Clapham, at Mr. Joseph Knight's Nursery, in 1811. The original was an imported plant, and was obtained from China in 1795, as I have been informed, by Mr. John Allen, who then lived gardener with Mr. Hibbert. A figure of a blossom of this variety, from the Clapham collection, had been published in 1804, in the Botanist's Repository, folio 373, with the name of Paeonia suffruticosa ; it is represented as quite double, and described as nearly scentless. It is also figured, and described by M. Bonpland in his Plantes Rares, tah. 23, page 61. The flowers are as large as those of the Banksii, of an uniform rich pink, though the edges of the petals become paler after a time. The exterior petals are large and broad, notched deeply in the centre,and with crisped margins; the interior petals are long and narrow, much jagged at the edges, very numerous, and they rise in the middle of the flower to a considerable height; the stamens appear mixed with the interior petals, and the germens are included in a membranous sheath. The scent is agreeable, but not so fine as in the semi-double variety. Semi-double flowers are often observable on the plant, at the same time that others quite double are produced, and sometimes, I have been told, all the blossoms produced in a season are semi-double. The imported plant of Mr. Hibbert first blossomed in 1796; it was then very weak, and the flowers it produced were nearly single ; but in the following year they were very double, and continued so in succeeding years. The variety now described has, hitherto been supposed identical with that which precedes it. I consider, however, there is sufficient difference between them to justify their being separated ; and I have therefore done so. In the account of this plant, in the Botanist's Repository above referred to, it is stated to have been introduced in 1794.
Notwithstanding the opinion above expressed on the difference of the two Roseas, I think it right to mention, that it is questioned by Messrs. Loddiges, to whose authority I am disposed to pay great deference. In the account of the figure of the Moutan Rosea, published in their Botanical Cabinet, and above referred to, as representing the semi-double variety, it is stated, that the plant from which the representation was taken, was originally obtained from Mr. Hibbert, and that it always produces semi-double flowers. Mr. Hibbert had certainly only one plant of the Rosea, which was that I have above described as having double flowers ; and I have heard that other plants, which are always semi-double, were derived from the same source. But notwithstanding the fact that some of the offspring of this double flowering plant have uniformly semi-double blossoms, yet as the original, as well as others produced from it, keep the character of bearing double flowers, I think the considering it as distinct is justifiable.