IP 06 t e Isia 211 



with all the other sections. In the position of 

 the cones, Eu- Abies and Pseiidotsuga have 

 lateral cones, Tsuga and Hespcropeuce terminal, 

 and Picea stands intermediate with usually 

 lateral but sometimes truly terminal cones. In 

 the presence of resin vesicles upon the seeds, 

 Hespero pence and Tsuga agree with Eu- Abies, 

 while Pseiidotsuga and Picea agree in their 

 absence. 



Botanical opinion has varied greatly as to 

 the generic value of the various groups of the 

 Abieiinece. Many botanists, including Linnaeus 

 and Parletore, in De Candolle's Prodro- 

 mus, have embraced all the species of this tribe 

 in the single genus Pinus. On the other hand, 

 all the sections of Abies mentioned above have 

 been recognised as genera together with Larix, 

 Cedrus, Pseudolarix and several segregates from 

 the true pines. It is to be noted that several 

 of the groups like Picea and Tsuga were de- 

 scribed as genera at a time when the AbietinecB 

 of western North America and eastern Asia 

 — over two-thirds of the species — were poorly 

 understood and many of them almost or quite 



