138 



TREES OF THE NORTHERN UNITED STATES 



1. Morus rubra, L. (RED MULBERRY.) Leaves 

 broad, heart-shaped, 4 to 6 in. long, serrate, 

 rough above and downy beneath, pointed; on 

 the young shoots irregularly lobed. Fruit dark 

 red, almost purple when ripe, cylindrical; not 

 found on all the trees, as the flowers are some- 

 what dioecious ; ripe in July. Wood yellow, heavy 

 and durable. Usually a small tree, 15 to 60 ft. 

 high; wild throughout, also cultivated. 



2. Morus dlba, L. (WHITE MULBERRY.) 

 Leaves obliquely heart-ovate, pointed, ser- 

 rate, smooth and shining ; lobed on the 

 younger growths; 2 to 7 in. long. Fruit 

 whitish, oval to oblong; ripe in July. A 

 small tree from China, planted for feeding 

 silkworms, but now naturalized throughout. 



Var. multicaulis has large leaves, and is 

 considered better for silkworm food than M.aiba. 



the usual form. It is not very hardy, as it is frequently winter- 

 killed in the latitude of New York City. 



Var. Downingii (Downing's everbearing Mulberry) has large leaves 

 and very large, dark red or black fruit, of excellent flavor, which 

 does not ripen all at once as most Mulberries do. 



GENUS 79. BBOUSSONETIA. 



Trees with milky juice and alternate, deciduous, stipu- 

 late, broad, very hairy leaves. Flowers dioecious. Fruit 

 (only on a portion of the plants) similar to the common 

 Mulberry. 



Broussonetia papyrifera, L. (PAPER- 

 MULBERRY. ) Leaves ovate to heart-shaped, 

 variously lobed, deeply so on the young 

 suckers, serrate, very rough above and 

 quite soft-downy beneath; leaves on the 

 ^<_ji^^- ld trees almost without lobes ; bark tough 



J and fibrous. Flowers in catkins, greenish ; 



B. papyrifera. ^ spring Fruit dub-shaped, dark scarlet, 



sweet and insipid ; ripe in August. Small cultivated tree, 10 to 35 ft. 

 high, hardy north to New York ; remarkable for the great variety 

 in the forms of its leaves on the young trees. 



