OF THE GENUS PINUS, 617 
in all the text-books, so that only certain points need here be 
alluded to. Schlechtendal’s paper, “‘ De Pinastris Germanie et 
Fig. 5. 
Pinus silvestris, showing verticillate arrangement of tufts of leaves, 
Helvetiz Observationes,” in Linnea, vol. xxx. (1857), may be 
usefully consulted for notes on P. silvestris, P. montana, 
P. Laricio, ete. 
