'70 Tennessee Flora. 



CELTIS L. 



Celtis occidentalis L. Hackberry. Maximum height, 120 

 feet by 5 feet diameter. O. S. April, May. Fruit matures in 

 September. 



C. Mississippiensis Bosc. Shrubby, or a smaller tree, as the 

 foregoing. In the dry glades of M. Tenn. April. A stunted 

 form is Celtis pumila Pursh. , 



HORACES Lindl. ' 

 MORUS L. 



Morus rubra L. Red mulberry. In rich soil. O. S. April, 

 May. Fruit ripe in June. 



M. alba L. White mulberry. Formerly used for feeding 

 silk worms, and, therefore, imported. Sparingly escaped. 

 May. Fruit matures in July, August. 



TOXILON Raf. (Madura Nut.) 



Toxilon pomiferum Raf. A small tree indigenous to the 

 Transmississippi region. Here planted for hedges, and occa- 

 sionally spontaneous. May, June. Fruit matures in October. 



BROUSSONETIA L'Her. 



Broussonetia papyrifera (L.) Vent. A small dioecious tree, 

 native of the South Sea Islands. Cultivated as a shade tree in 

 Europe and America. All those in Nashville, with a single 

 exception, are male. May, June. Fruit in September. 



HUMULUS L. 



Humulus Lupulus L. Hop. Sometimes found escaped 

 from cultivation. July, August. .Our climate is not congenial 

 to hop culture. M. 



CANNABIS L. 



Cannabis sativa L. Hemp. In waste places, escaped from 

 cultivation or scattered from bird cages. Native of Europe 

 and Asia. July-September. M. 



URTICACE^ Reichenb. 

 URTICA L. 



Urtica dioica L. Stinging nettle. Frequently introduced, 

 but not naturalized in Tennessee. June, July. 



U. gracilis Ait. Along fence rows in the mountains of E. 

 Tenn. May, June. , 



U. urens L. The burning nettle. In waste places in towns 



