XXVI. ROSA^CEJE : PY V RUS. 



433 



Varieties. 



t P. A. 1 obtusifolia Dec. Prod. ii. p. 636., and Fl. Dan. t. 302. ; P. A 

 ovalis Hort.- Leaves broadly ovate, and obtuse. 



If P. A. 2 aculijblia Dec. Prod. 1. c. Cratae'gus longifolia N. Du Ham. 

 4. t. 34. ; ? JPyrus alpina Willd. Enum. 527. The leaves are ovate- 

 oblong and acute. 



* P. A. 3 undulata Lindl. Hort. Trans, vii. p. 234., and the plate in 

 Arb. Brit. 1st edit. vol. vi., and our fig. 780., has the leaves flat, oval- 



780. P. AVi& undul&ta. 



lanceolate, broad, undulated, unequally and deeply serrated, acumi- 

 nated, and cobwebbed above. 



P. A. 4 angustifoha Lindl. 1. c., P. A. longifolia Hort., has the leaves 

 oval, obtuse, concave, somewhat simply serrated, woolly above. 



t P. A. 5 rugosa Lindl. 1. c. Leaves large, ovate-elliptic, doubly ser- 

 rated, shining above and wrinkled, white beneath. 



t P. A. 6 cretica Lindl. 1. c. P. A. rotundifolia Hort. ; P. grae'ca Hort. ; 

 P. A. edulis Hort.; C'ratae v gus gree'ca Hort. Leaves flat, orbicu- 

 larly elliptic, crenately serrated, retuse, cuueated at the base ; smooth 

 above, and hoary beneath. Branches cobwebbed. 



t P. A. 7 bullata Lindl. Hort. Trans, vii. p. 234., P. A. acuminata 

 Hort., has the leaves concave, elliptic, acuminated, blistered ; closely 

 serrated at the apex, but entire at the base. 



The rate of growth, when the tree is young and in a good soil, is from 18 in. 

 to 2 ft. a year : after it has attained the height of 15 or 20 feet it grows much 

 slower ; and, at the age of twenty or thirty years, it grows very slowly j but 

 is a tree of great duration. T^e roots descend very deep, and spread very 

 wide ; and the head of the tree is less affected by prevailing winds than almost 

 any other. In the most exposed situations, on the Highland mountains, this 

 tree is seldom seen above 10 or 15 feet high ; but it is always stiff and erect. 



F F 



