269] FLORA OF COLUMBIA AND VICINITY I 27 



321. U. dioica L. Stinging nettle. 

 Weed in waste grounds. 



Europe, Asia and North Africa, thence to North 

 America. 



322. U. gracilis Ait. Slender nettle. 



Common in alluvial bottoms and waste places in low rich 

 grounds. 



Nova Scotia to British Columbia; North Carolina to 

 Louisiana and Kansas. 



120. LAPORTEA Gaud. iURTICASTRUM Fabx.']. 

 Wood nettle. 



323. L. Canadensis Gaud. [U. divaricatum (L.) Kuntze]. 

 Common in alluvial bottoms in shade. 



Nova Scotia to Minnesota and South Dakota; Florida 

 to Kansas. 



121. PILEA Lindl. [AD/CEA Raf.]. Clearweed. 



324. P. pumila (L.) Gray [A. pumila (L.) Raf.]. Richweed. 

 Common in alluvial bottoms and wooded swamps in 



shade. 



New Brunswick to Minnesota and South Dakota; 

 Florida to Louisiana and K\nsas. 



122. BOEHMERIA Jacq. False nettle. 



325. B. cylindrica (L.) Willd. 



Alluvial bottoms and wooded swamps in shade; common. 

 Quebec to Minnesota and Nebraska; Florida to Kansas. 



123. PARIETARIA Tourn. Pellitory. 



326. P. Pennsylvanica Muhl. 



In hedges, crevices of damp rocks, and damp waste or 

 wild half-open or deeply shaded places; common. 



Ontario to British Columbia; Florida to Colorado and 

 Mexico. 



