XXVI. ROS.\CEM : PY^RUS. 



-433 



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

 ovalis Hort. Leaves broadly ovate, and obtuse. 



t P. A. 2 aculijoiia Dec. Prod. 1. c. C'ratae'gus longifolia .V. Du Ham. 

 4. t. S^. ; ? Pyrus alpina Willd. Enum. 527. The leaves are ovate- 

 oblong and acute. 



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

 Arb. Brit. 1st edit. vol. vi., and owy fig. 780., has the leaves flat, ovaU 



V-- 



780. /'. /iVia undulkta. 



I 



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

 nated, and cobwebbed above. 



'^ P. A. i angtistifolin Lindl. 1. c, P. A. longifolia Hort., has the leaves 

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



Y V. A. 5 riigosalAndl. I.e. Leaves large, ovate-elliptic, doubly ser- 

 rated, shining above and wrinkled, white beneath. 



i P. A. 6 cretica Lindl. 1. c. P. A. rotundifolia Hort. ; P. graeVa Hort. ; 

 P. yi. ediilis Hort.; C'ratae^gus grse^ca Hort. Leaves flat, orbicu- 

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

 above, and hoary beneath. Branches cobwebbed. 



5? P. A. 7 buUdta 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. 

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

 3\ver ; and, at the age of twenty or thirty years, it grows very slowly ; but 

 I a tree of great duration. The roots descend very deep, and spread very 

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

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

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



F F 



