XXVI. ROSA CEH: PY‘RUS. 433 
Varieties. 
¥ P. A. 1 obtusifilia Dec. Prod. ii. p. 636., and Fl. Dan. t. 302.; P. A 
ovalis Hort.— Leaves broadly ovate, and obtuse. 
¥ P. A. 2 acutifolia Dec. Prod. 1. c. Crate'‘gus longifolia N. Du Ham. 
4, t. 34.3 ? Pyrus 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. Ist edit. vol. vi., and our fg. 780., has the leaves flat, oval- 
780. P. A‘ria undulata. 
lanceolate, broad, undulated, unequally and deeply serrated, acumi- 
nated, and cobwebbed above. 
¥ P. A. 4 angustifolia Lind]. 1.¢.. P. A. longifolia Hort., has the leaves 
oval, obtuse, concave, somewhat simply serrated, woolly above. 
+ P. A. 5 rugosa Lindl. |, c.— Leaves large, ovate-elliptic, doubly ser- 
rated, shining above and wrinkled, white beneath. 
# P. A. 6 crética Lindl. l.c. P. A. rotundifolia Hort.; P. gree‘ca Hort. ; 
P, A. edulis Hort.; Crate‘gus gre‘ca Hort.— Leaves flat, orbicu- 
larly elliptic, crenately serrated, retuse, cuneated at the base ; smooth 
above, and hoary beneath. Branches cobwebbed. 
¥ 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 2ft. 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; but 
is a tree of great duration. The 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. 
FF 
