Western Mountain-Ash. Sorbus arnericana sitchensis. 
Leaves 4 to G inches long composed of 7 to 13 oblong 
oval to lance-ovate leaflets serrate above the middle, 
dark blue green above, pale beneath. Flowers one- 
fourth inch in diameter. Fruit a scarlet berry often 
one-half inch in diameter, formed in clusters and ripen- 
ing in early fall. 
Western mountain-ash occurs sparingly in south- 
eastern Alaska but is often cultivated as an ornamental 
tree. It seldom exceeds 30 feet in height but has a 
round-topped, handsome head. Little is known defi- 
nitely of its range. It may be easily distinguished 
from the European mountain-ash by its leaflets, which 
are serrate above the middle only and somewhat 
rounded at the ends. The leaves are composed of a 
smaller number of leaflets than European mountain-ash 
leaves, and the berries are slightly larger and in nar- 
rower clusters. The form of the tree is usually more 
irregular than that of the European mountain-ash. 
European Mountain-Ash. Sorbus aucuparia. 
Leaves alternate, composed of 9 to 17 lance-shaped 
leaflets with serrated edges, without teeth toward the 
base, dull green above but slightly hairy beneath, 
three-fourths to 2 inches long. The flowers are in 
corymbs, or clusters, 4 to G inches broad, each white 
flower being one-third inch across. Fruit a berry, 
one-third inch in diameter, bright red and ripening in 
August in Alaska. A round symmetrical-headed tree 
20 to 40 feet high with smooth aromatic bark. 
The European mountain-ash is found sparingly 
naturalized along tho coast of southeastern Alaska as a 
domestic tree in the towns. It is an exotic species, 
cultivated as an ornamental tree in the United States 
and Canada, and is not a true ash. 
