vii 



Owing to the great merit and utility of London's 

 Arboretum, his nomenclature has hitherto been uni- 

 versally adopted in the United Kingdom. It contains 

 descriptions of about 70 species of Abietineae. 



In 1841 Link (in Linnaea, vol. xv., p. 481) reviewed 

 the whole Tribe of Abietineae, retaining, as before, 

 Pinus, Picea, Abies, Larix, and Cedrus, and enumerating 

 52 species. 



In 1841-46, Antoine's Die Coniferen appeared, in 

 which all the Abietineae are referred to Pinus, with 

 sections of Pinus proper, Larix, Cedrus, Picea, Don, 

 Abies, Don, and Tsuga ; he describes 90 species. 



In 1842 Spach, in his Histoire Naturelle des Vegetaux, 

 adopted Pinus, Abies (including under it as sections 

 Picea, Link, Tsuga, and Pseudotsuga), Cedrus, and 

 Larix. 



Endlicher, in the same year, in his Genera Plan- 

 tarum reverted to Linnaeus' practice of including all 

 under Pinus, but made four sections Pinus proper, 

 Picea, Link, Abies, Link, and Larix, including Cedrus. 



In the same author's Synopsis Coniferarum, published 

 two years later, he maintains the genus Pinus entire, as 

 before, but subdivides it into 11 sections, with 109 

 species. 



In 1850 Lindley and Gordon published (in the 

 Journal of the Horticultural Society, voL v.) " An 

 Enumeration of Coniferae cultivated in Great Britain," 

 where two genera only are adopted, Pinus and Abies+ 

 and the latter is subdivided into Firs (including Spruces),. 

 Larches, and Cedars, with 119 species. 



