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MANUAL OF POISONOUS PLANTS 



Genera of Urticaceae 

 Herbs with stinging hairs. 



Leaves opposite ; flowers 4-parted 2. Urtica. 



Leaves alternate; staminate flowers 5-parted 3. Laportea. 



Herbs or trees without stinging hairs. 



Herbs ; pistillate flowers spiked 1. Cannabis. 



Trees ; staminate flowers racemose 4. Madura. 



1. Cannabis, Tourn. Hemp 



Dioecious herbs with tough fiber to the inner bark; greenish flowers; sepals 

 5 in the staminate, 1 in the fertile flower ; achene, crustaceous. 



Cannabis saliva, L. 



Stem from 4-8 feet high with broad, divided leaves, the linear-lanceo- 

 late segments sharply and closely serrate ; greenish flowers with narrow stam- 

 inate panicles and erect pistillate spikes, the sterile with 5 sepals and 5 stamens, 

 fertile flowered spiked, with 1 sepal ; fruit hard ovoid, achene oblong. 



Distribution. Native to Europe and Asia and in waste places from New 

 Brunswick to Tennessee, Kansas and Minnesota. 



Fig. 191. Hemp {Cannabis sativa). .Staminate and pistillate 

 flowering branches; fruit; longitudinal section of fruit. (After 

 Faguet.) 



