Magazine  (1826)  Page(s) 486-487.  
 
[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]
...Kaempfer, in the fifth fasciculus of his Amaenitates Exotica., printed in 1712, describes the plants of Japan, and (page 862) among them the Botan, as a species ; but does not mention any varieties. He distinguishes it by its woody stem from an Herbaceous Paeony called Saku Jaku, of which he names three varieties. Thunberg, in his Flora Japonica, printed in 1784 (page 230), confounds the Saku Jaku and Botan together, referring both, most absurdly, to the Paeonia officinalis of Linnaeus, and states that they are cultivated in every garden of Japan. The Saku Jaku of Kaempfer is, according to the printed opinions of those who have attended to Paeonies, referable to the species well known in our gardens as P. albiflora, though neither of the varieties mentioned by him have white flowers.

Magazine  (1818)  Page(s) 287.  
 
[Joseph Sabine comments on December 20, 1817 on the first volume of De Candolle's Systema Naturale Regni Vegetabilis, "which has just arrived from Paris"]
 ....One reference of M. De Candolle, viz. that to “Saku Jaku, Kæmpf. Amæn. v. p. 862,” I must consider as very doubtful: the result of every inquiry I have made is, that only P. Moutan and P. albiflora, with all their varieties, are cultivated in China and Japan; the Botan of Kæmpfer is the first of these species, and I believe the Saku Jaku is a variety of the latter with single red flowers, and that the two double varieties of the same, mentioned by Kæmpfer, are our P. albiflora Whitleji and P. albiflora fragrans.

Magazine  (1808)  Page(s) tab 1154.  
 
Paeonia Moutan. The Moutan, or Chinese Tree-Peony.....
Thunberg, as well as Loureiro, as is evident by his having given as synonyms both the Saku-Jaku and Botan of Kempfer, confidered this plant to be the same species with the Paeonia officinalis of Linnaeus, which is likewise cultivated in China, and much used there in medicine.

Book  (1712)  Page(s) 862.  
 
Saku Jaku, vulgo & literatis it. Kawu Júnkusa. Pœonia communis seu fœmina, trifolio ramoso, flore sanguineo simplici.
Eadem flore plenissimo incarnatao.
Eadem, petalis in medio longis surrectis, cristam referentibus.