MORACEiE 253 



of three to five partly united sepals. The single superior 

 ovary is one- to two-celled and bears one to two styles. 

 The jruit is drupe-like in mulberries, an achene in hops and 

 hemp, and a synconium in figs. 



Key to Principal Genera 



Trees or shrubs. 



Flowers not in a receptacle; buds scaly, Morus (mulberry). 



Flowers inside of a hollow receptacle; buds naked, Ficus (fig). 

 Herbs. S 



Erect herbs, Cannabis (hemp). 



Twining herbs, Humulus (hop). 



MORUS (Mulberry) 



Habit, Stems. — Mulberries are trees or shrubs with milky 

 sap and scaly bark. The branches are slender and cylindrical. 

 The winter buds are scaly. 



Leaves. — The leaves are conduplicate (Fig. loi) in the bud, 

 alternate, serrate, three-nerved, often deeply lobed, and 

 deciduous. The stipules fall soon after development. The 



convolute plicaU conduplicate 



Fig. ioi. — Three principal types of vernation. 



leaves on one shoot may be relatively entire, while those on 

 another may be moderately or deeply and irregularly lobed. 

 Inflorescences. — The flowers appear rather early in the 

 season in the axils of the lower leaves. The staminate and 

 pistillate inflorescences may be on different branches of the 

 same tree (monoecious) or on different trees (dioecious). 



