62 THE AMERICAN MIDLAND NATURALIST. 
Urticaceae. Nettle Family. 
Urtica gracilis Ait. NETTLE. 
Woods, thickets, roadsides. Common. July 5. 
Urticastrum divaricatum (1,.) Kuntze. WOOD NETTLE. 
Woods. Common. July to. 
Pilea pumila (L.) A. Gray. — CLEARWEED. 
River bank. Occasional. P 
Cannabinaceae. Hemp Family. 
Humulus lupulus VL. HOP. 
Woods and thickets. Common. June 30. 
Cannabis sativa I. HEMP, 
Occasionally escaped along roadside. 
Ulmaceae. Elm Family. 
Ulmus americana \,. WHITE ELM. 
Woods. Common. Apr. 20 (20); excluding Mar. 28, 1gIo. 
Ulmus fulva: Michx. RED ELM. 
Said to occur at least on the Minnesota side but I have been 
unable to verify it. 
Celtis occidentalis L,. HACKBERRY. 
Woods. Frequent. 
Polygonaceae. Buckwheat Family. 
Rumiex acetosella \,. *SORREL DOCK. 
Roadsides. Occasional. June 5. We have been using this com- 
mon name which seems more appropriate than the usual Field or 
Sheep Sorrel (the latter so commonly applied to Oxalis violacea). 
~ 
Rumex mexicanus Meisn. WILLOW-LEAVED DOCK. 
Low places, fields, and roadsides. Common. June 5 (7). 
Rumex occidentalis S. Wats. WESTERN DOCK. 
Drainage ditch 2 mi. north (Stevens in 1920). 
Rumex crispus 1. CURLED DOCK. 
Low roadsides. Frequent. 
Rumex persicarioides VL. GOLDEN DOCK. 
Low ground. Common. June 30. 
P.lygonum aviculare L. ; KNOTWEED-DOORWEED. 
Yards, roadsides ete. Common. May 30. 
Polygonum erectum \,. UPRIGHT KNOTWEED. 
Roadsides etc. Common. June Io. 
Polygonum ramosissimum Michx. BUSHY KNOTWEED. 
Roadsides, etc. Common. 
(TO BE CONTINUED) 
