M r. Haworth's Twelfth Decade of New Succulent Plants. 107 



The native countries of these new plants are stated below 

 throughout, and also their technical characters and defini- 

 tions ; with detailed descriptions and with due acknowledge- 

 ments to those collections in which I have been obligingly 

 permitted to make them from the living plants. These, it is 

 hoped, will be found welcome to your botanical readers both at 

 home and abroad ; for I am happy to add, that every plant you 

 have published from me, with due reference to your valuable 

 Miscellany, (as quickly as time allows it,) enters and takes its 

 appropriate place in those great records of botanical science, 

 (now publishing on the Continent,) the vast works of Decan- 

 dolle and Schultes ; — the former in Natural Orders, and above 

 mentioned ; and the latter in Linnaean Classes, and called 

 Caroli a Linne, Si/stema Vegetabilium, Editio Nova. 



Perhaps no Linnaean genus of plants of similar magnitude 

 has received so many additions to it, through the unceasing 

 labours of modern research, (and which, in every direction, 

 is extensively proceeding,) as his famous Genus Cactus. In 

 his own last edition of the celebrated Species Plantanim, vol. i. 

 p. 166, published in 1764, he enumerates, from every then 

 existing source, only twenty-three species of Cactus, divided 

 into four sections ; and many even of those species he had 

 never seen, having taken them up from the representations 

 or accounts of others. And even the last edition of our classic 

 Hortus Kexi-ensis has but twenty-four. 



But we may now behold, even in a state of successful cul- 

 tivation, not fewer than ten times as many. 



It is in consequence of this exuberant harvest, that the 

 writer of this paper is now able to complete his twelfth De- 

 cade of ncm Succulent Plants, and all of the natural order 

 CactecC; notwithstanding the new Systema Vegetabilium of 

 Sprengel, in five very large octavo volumes. The Melocacti 

 and EcJiinocacti of Link and Otto, with many plates, (which 

 they have very kindly presented to the writer,) and the excel- 

 lent Prodromus Sijslematis Natiiralis Regni VegetahiUs of the 

 great botanist DeCandolle; and on the present subject his still 

 more recent and interesting Revue de la Famille de CacteeSy 

 with coloured figures, (which he has also kindly given to the 

 writer,) and in which above forty new species of Cactcce (all 

 sent alive from Mexico to DeCandolle, by the writer's friend 

 Dr. Coulter*,) are for the first time arranged, named, and 

 described. In the last-mentioned publication too, every thing, 

 whether old or new, pertaining to the Cactean natural order 

 of plants, is extensively discussed, with the ability of an his- 



• Dr. Coulter went out as physician in the service of the Real del Monte 

 Company, having been recommended to the Directors by Boine of the Offi- 

 cerb of the I^inna^an Society. 



P 2 torian, 



