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  (1838)  Page(s) 250, 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.
2. P. Moutan variegàta D. Don.  The particoloured- petaled Moutan Peony. — A low-growing bushy kind, branching from the ground, and scarcely woody.  Flowers about 6 inches across.  Petals white, stained with a deep rose-colour in various parts; the base marked with numerous radiating streaks of violet and purple.  Anthers yellow.  The Earl of Mount Norris, whose successful culture of the tree peony has been rewarded by the production of several splendid varieties, far excelling any of those imported from China, has been so fortunate as to raise this fine variety also, which is remarkable for its dwarf and almost herbaceous habit.  It was raised from seeds of the P. Moutan papaveràcea, which the Earl of Mount Norris supposes had been accidentally fertilised by some of the herbaceous species.  All the varieties raised at Arley were from P. Moutan papaveràcea, and not from P. Moutan Bánksii, as the gardener had inadvertently stated.  (D. Don, in Sw. Fl.-Gar., 2d ser., t. 238; G. M., vol. x. p.284.)