188 
Bulletin Wisconsin Natural History Society. [Vol. 5, No. 4. 
URTICACE^. 
ULMACEAE. 
Ulmus aniericana L. White Elm. 
Common. 
V. lacemosa Thomas. Cork or Eock Elm. 
In western part of county and occasional in eastern portion. 
U. fulva Michx. Eed or Slippery Elm. 
Throughout county. 
Celtis occidentalis L. Sugar-berry. Nettle-tree. 
Along Milwaukee Eiver in extreme northern part of county ; 
also in Menomonee Valley. 
MORACEAE. 
Humulus Lupulus L. Hop, 
Occasionally escaped from cultivation. 
Cannabis sativa L. Hemp. 
Occasionally escaped from cultivation. 
URTICACEAE. 
Urtica dioica L. Great Nettle. 
Common. 
U. gracilis Ait. Slender Nettle. 
Common. 
Laportea canadensis (L.) Gaud. XJrticastrum divaricatum (L.) Kuntze. 
Wood Nettle. Common sounth and west. 
Pilea pumila (L.) Gray. Adicea pumila (L.) Eaf. 
Clear-weed. Eichweed. Throughout coimty. Common. 
Boehmeria cylindrica (L.) Sw. False Nettle. 
Common. 
Parietaria pennsylvanica Muhl. Pellitory. 
A weed in gardens. 
SANTALACE^. 
Commandra umbellata (L.) Nutt. Bastard Toad Flax. 
In southern part of county, in Menomonee Valley and at 
Whitefish Bay. Not common. 
