COMPLIMENTARY 
NEW SERIES VOL. Vlli 
NO. 10 
ARNOLD ARBORETUM 
HARVARD UNIVERSITY 
BULLETIN 
OF 
POPULAR INFORMATION 
JAMAICA PLAIN, MASS. JUNES. 1922 
Crataegus pedicellata belongs to the Coccinae Group in which are 
arranged a number of trees and tree-like shrubs with large, thin leaves 
usually broader than long, flowers from half an inch to an inch in 
diameter with from flve to twenty stamens and rose-colored or very 
rarely yellow anthers. The plants of this Group are confined to the 
northeastern part of the country; they are common in Quebec, New 
England and New York; westward they are found in Ohio, southern 
Michigan, northern Illinois and southern Wisconsin; a few species occur 
in eastern and in western Pennsylvania, and so far as is now known 
the southern limit of the Group is reached in Delaware with one spe- 
cies. No representative of this Group has yet been found in the terri- 
tory west of the Mississippi River. These plants are shapely small 
trees and among them are some of the handsomest Thorns which can 
be grown in northern gardens. Crataegus pedicillata is a good repre- 
sentative of the Group. It is a tree sometimes twenty feet high 
with a tall trunk up to a foot in diameter, and slender spreading and 
ascending branches which form a symmetrical head; the leaves are 
broad-ovate to rhombic with a wide, rounded or abruptly narrowed 
base, and are nearly fully grown when the flowers open. These are 
arranged in wide, many-flowered, slightly hairy corymbs, and are about 
half an inch in diameter with usually ten stamens and rose-colored 
anthers. The fruit, which ripens and falls in September, is pear-shaped 
until fully grown, becoming short-oblong when fully ripe when it is 
lustrous, bright scarlet and about three-quarters of an inch in length. 
This Thorn is common in central and western New York and occurs in 
western Pennsylvania and in southern Ontario in the neighborhood of 
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