STATE GEOLOGIST. 125 



PILEA, Lindl. Richweed. Clearweed. 



P, puniila, Gray. Richweed. Cleaiweed. 



St. Croix river, Parry; Minneapolis, Simmons; lake Minuetonka (common), Bobeefs; 

 Blue Eartli couaty, Leiherg; Fergus Falls, Leonard. South . 



BCEHMERIA, Jacq. False Nettle. 



B. cyliudrica, Willd. False Nettle. 

 Lapham. Fergus Falls, l/co/iard. Infrequent. 



PARI ET ARIA, Tourn. Pellitory. 



P. Peiiusylvauica, Muhl. Pellitory. 



Minneapolis (presenting, besides the type, a larger and much branched form), Ber- 

 rick, Simmoni'; Blue Earth county, Leiherg; and northwest to the upper Missouri and 

 Saskatchewan rivers. Infrequent. South and west. 



CANNABIS, Tourn. Hemp. 



C. sat!va, L. Hemp. 



A commou or frequent weed. 



HUMULUS, L. Hop. 



H. Liiipulus, L. Common Hrp. 



Common, especially northward ; "native on all the tributaries of the upper Missis- 

 ippi," Parry. 



PLATANACE^. Plane-tree Family. 



PLATANUS, Tourn. Plane-tree. Button wood. 



P. occidentalis, L. American Plane-tree. Buttonwood. Sycamore. 



Lapham. Southeast, i-are. The northwest limit of this species scarcely enters 

 Minnesota. 



JUGLANDACEiE. Walnut Family. 



JUGLANS, L. Walnut. 



J. ciuerea, L. Butternut. - Oil-nut. White Walnut. 



Common southward, but absent far southwest ; extending north to the Snake river 

 in Pine and Kanabec counties, Norwood, Upham, and on the Mississippi river to the 

 north line of Aitkin county, Garrison. Wood valuable for cabinet work and in liouse- 

 building for inside finishing 



J. nigra, L. Black Walnut. 



Frequent in the south part of the state ; extending north to Nininger, Dakota 

 county, southern Scott and Carver counties, and to Walnut Grove in the south edge of 

 Redwood county. Because of the great value of its lumber, nearly all the black wal- 

 nut of large size in this state has been cut ; but much of young growth remains. 



CARYA, Nutt. Hickory. 



C. alba,Nutt. Shell-bark or Shag-bark Hickory. "Walnut." 



Common, or frequent, in Houston county; extending north into Winona county at 



