URTICACEAE 73 



1. MORUS L. ' 



Small trees with milky juice and alternate leaves. Flowers in catkin- 

 like spikes. Sepals and stamens four. Calyx becoming succulent in 

 fruit, and the whole pistillate spike thickening into a juicy, oblong fruit. 



1. M. rubra L. Mulberky. Leaves ovate, heart-shaped, acuminate, 

 serrate, downy beneath. — Frequent throughout in rich soil. April-May. 



2. TOXYLON Raf. 



Small spiny trees with milky juice and alternate entire leaves. Pis- 

 tillate flowers capitate, the stamiuate racemose. Sepals and stamens 

 four. Calyces greatly enlarging in fruit, and forming a large, globular 

 head. 



1. T. pomiferum Raf. Osage Orange. Leaves ovate-lanceolate, 

 thick and shining : fruit 2^-6^ in diameter. — Commonly used for hedges 

 and often persistent after cultivation or spreading from the roots. 



3. HUMULUS L. 



Twining rough vines with opposite leaves. Staminate flowers panicled, 

 the pistillate in drooping spikes. Sepals in staminate flowers and stamens 

 five. Pistillate flowers two together in axils of foliaceous bract, and cov- 

 ered by a solitary sepal. 



1. H. Lupulus L. Hop. Leaves heart-shaped at base, serrate or 3-5- 

 lobed and serrate : calyx and achene resinous-aromatic. — Common in 

 thickets along streams. July-October. 



4. CANNABIS L. 



A stout herb with alternate leaves and dioecious flowers. Staminate 

 flowers panicled, composed of 5 sepals and 5 stamens. Pistillate flowers 

 spiked, clustered, consisting of a large foliaceous calyx folded around the 

 sessile ovary. 



1. C. sativa L. Hemp. 4°-12° high : leaves digitately 5-11-cleft, 

 the linear-lanceolate divisions toothed. — Common in waste places. July- 

 September. 



Family 34. URTICACEAE Reichenb. 



Herbs with usually stipulate, petioled leaves and unisexual flowers. 

 Calyx 2-5-cleft, the stamens as many as its lobes. Ovary superior, 

 1-celled, containing one erect ovule. Stigma simple. Fruit an achene. 



Leaves alternate. 



Herbs with stinging hairs. 2. Urticastrum, 



Herb^ without stinging hairs. 5. Parietaria. 



Leaves opposite. 



Plant very glabrous. 3. Adicea. 



Plant more or less hairy. 



Flowers in axillary compound panicles. 1. Urtica. 



Flowers glomerate in axillary spikes. 4. Boehmeeia. 



