910 ARBORETUM AND FRUTICETUM. PART III. 
P. Sievérsii Led. Fl, Alt., 2. p. 222., Don’s Mill., 2. p. 647.; P. nov. sp. Sievers in Pall. Nord. 
Beitr., 7. p. 292., is a bush, with many stems rising from the same root; with ovate leaves rather 
tomentose, and umbellate flowers, succeeded by very acid fruit. It is a native of Siberia; and it is 
rather remarkable that it has never been introduced into England, 
§ iii. A'vza Dec. 
Sect. Char., §c. Petals spreading, flat. Styles mostly 2—3. Pome globose. 
Flowers in racemose corymbs; the peduncles branched. Leaves simple, 
not glanded, whitely tomentose beneath. (Dec. Prod., ii. p. 635.) Deciduous 
trees, natives of various parts of Europe, and of Asia; chiefly found on 
dry, calcareous, or clayey soils, and varying much ina state of culture. The 
species and varieties are in a state of great confusion. 
¥ 21. P. A’ria Ehrh. The White Beam Tree. 
Identification. Ehrh. Beitr., 4. p.20.; Dec. Prod., 2. p. 636. ; Don’s Mill., 2. p. 647. 
Synonymes, Crate‘gus A‘ria var. « Lin. Sp., 681.; Méspilus A’ria Scop.; Sérkus A‘ria Crantz 
Austr., 1. t. 2. f.2.; Bauh. Hist., 1. p.65.; A’ria Theophrasté L’Obel. ; white wild Pear, white Leaf 
Tree, red Chess- Apple, Sea Ouler, Cumberland Hawthorn Gerard; Alisier Allouchier, Alisier blanc, 
Fr. ; Mehlbeerbaum, or Mehlbaum, Ger. ; Aria, or Sorba pilosa, Ital. ; Mostaco, Span. ; Axelbeer, 
Dan. ; Oxilbear, Swed. 
Derivation. A*ria, the name given to this tree by ‘Theophrastus, is probably from the name of that 
country in Asia. The White Beam ‘Tree is a pleonasm, beam being the Saxon word for tree. The 
word Allouchier is from allouchion, the cog of a wheel, the wood of the tree being much 
used for that purpose in France, Mehlbaum is literally the meal tree, from the mealy appearance 
of the under side of the leaves. 
Engravings. Crantz Austr., 1. t.2. f.2.; Eng. Bot., t. 1858. ; Fl. Dan., t. 302. 
Spec. Char., §c. Leaves ovate, doubly serrated, tomentose beneath, with ap- 
pressed white tomentum. Corymbs flat. (Dec. Prod.,ii. p. 636.) 
Varieties. 
+ P. A. 1 obtusifolia Dec. Prod. ii. p.636., and Fl. Dan., t. 302.; P. A. 
ovalis Hort.—Leaves broadly ovate, and obtuse. 
P. A. 2 acutifilia Dec. Prod., |. c.; Crate‘gus longifolia N. Du Ham., 
4. t. 34.; ? Pyrus alpina Willd. Enum., 527.; which has ovate-oblong 
acute leaves. 
* P.A.3 unduldta Lindl. Hort. Trans., vii. p. 234., and our plate in Vol. 
II., has the leaves flat, oval-lanceolate, broad, undulated, unequally 
and deeply serrated, acuminated, and cobwebbed above. 
+ P. A. 4 angustifolia Lindl., |. c., has the leaves oval, obtuse, concave, 
somewhat simply serrated, woolly above. 
+ P. A. 5 rugosa Lindl., 1. 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.gre‘ca Hort. 
— Leaves flat, orbicularly elliptic, crenately serrated, retuse, cune- 
ated at the base; smooth above, and hoary beneath. Branches 
cobwebbed. 
* P. A. 7 bulldta 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. 
Description, §c. This tree rises to the height of 30 ft. or 40 ft. in favour- 
able situations, with a straight, erect, smooth trunk, and numerous branches, 
which for the most part tend upwards, and form a round or oval head. The 
young shoots have a brown bark, covered with a mealy down; the leaves are 
between 2 in. and 3 in. long, 14 in. broad in the middle, light green above, and 
very white and downy beneath. The flowers are terminal, in large corymbs, 
2 in. or more in diameter, and they are succeeded by scarlet fruit, which makes 
a very conspicuous appearance in the autumn, but of which the tree seldom 
bears two good crops in succession. 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 ft. or 20ft. 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 
