xxxiv General Key to Families 



TREES, SHRUBS, OR VINES WITH WATERY JUICE. 



Leaves deciduous. 



Flowers in catkins. 



Staminate and pistillate catkins on different 

 plants; seed with white, silky hairs. 



Salicaceae. 



Staminate and pistillate catkins on the same 

 plant; fruit cone-like. Betulacese. 



Flowers not in catkins. 



(A) Trees. 



Leaves simple, not lobed; flowers white. 



Drupacese. 

 Leaves lobed; flowers greenish-yellow. 



Aceraceae. 

 Leaves pinnate; flowers white. Pomacese. 



(B) Shrubs or vines. 



*Stems spiny erect or trailing, 

 (a) Leaves simple or lobed. 



Flowers small in dense terminal racemes. 



Araliaceae. 



Flowers few in axillary clusters or ra- 

 cemes. Grossulariaceae. 

 (6) Leaves pinnate or palmate. Rosaceae. 

 **Stems not spiny but with minute scales; 

 fruit silver, scarlet or orange berries. 



Elaeagnaceae. 

 ***Stems erect, smooth. 

 (a) Petals distinct. 

 f Leaves simple. 



Flowers small, in flat heads or clusters. 

 Petals 4 ; stamens 4. Cornaceae. 

 Petals 5 ; stamens numerous. 



Rosaceae. 



