562 



URTICACE^B. 



clusters. A common weed, too well known to need 

 further description. Fl. July, August. Perennial. 



2, U. urens (Small Nettle). Leaves elliptical ; flowers 

 in short, nearly simple clusters. Waste places, abundant. 

 Smaller than the last, but closely resembling it in habit 

 and properties. Fl. July October. Annual. 



* U. pilulifera (Roman Nettle) is an annual species, 

 of local occurrence; it bears its flowers in globular 

 heads. 



PARIETARIA OFFiciNALis (Common Pellitory-of-the-wall}. 



2. PARIETARIA (Pellitory-of-the-wall). 



1. P. offitindlis (Common Pellitory-of-the-wall). The 

 only British species. A much-branched, bushy, herba- 



