366 CLASS XXI. ORDER IV. 



Urtica CANADKNsrs. L. Canada Nettle. 



Leaves alternate, heart- ovate, acuminate, serrate, 

 hispid on botli sides; panicles axillary, mostly gemi- 

 nate, with divaricate branches, the lower ones barren, 

 longer than the petioles, upper ones fertile, elongated; 

 stem hispid and stinging. 



Five or six feet high with large leaves. — On the banks of Con- 

 necticut river, in Orford, New Hampshire. — This appears to be 

 the plant formerly proposed by Mr. Whitlow as a substitute for 

 hemp. 

 Urtica Pumila. L. Richweed. 



Leaves opposite, ovate, acuminate, three nerved, 

 serrate; lower petioles as long as the leaf ; flowers 

 monoecious, triandrous, in c6rymbed heads, shorter 

 than the petioles. Willd. 



A weed about houses, distinguished by its stem, which is 

 fleshy and almost transparent. Leaves smooth and shining, 

 regularly toothed or serrate, very distinctly three nerved, with 

 long petioles. Flowers in short axillary racemes or heads, re- 

 peatedly forked and recurved. — August. — September. — Annual. 



377. BCEHMERIA. 



BcEHMERiA CYLiNDRicA. JVilld. CuttiTnon JBcehmeria. 



Leaves opposite, ovate-oblong, acuminate, dentate, 

 glabrous; flowers dioecious ; barren spikes interrupt- 

 ed, fertile ones cylindrical ; stem herbaceous. Willd. 

 Syn. Uktica cylindrica. L. 



Stem erect, round, channelled, hairy or subglabrous. Leaves 

 opposite, petioled, ovate, toothed, three nerved, acuminate. 

 Spikes axillary, simple, of many whorls, leafy at top. The bar- 

 ren flowers, while young, appear like white buds or seeds, and 

 consist of a four leaved calyx and four elastic stamens. Fertile 

 flowers more numerous, with ovate germs and pubescent styles. 

 — Edges of swamps, on the Concord turnpike. — July. — Pe- 

 rennial. 



