206 
IOWA ACADEMY OP SCIENCES. 
184. S. humilis Marsh. Frequent in dry open ground. 
185. S. discolor Muhl. Wet meadows and banks of 
streams; common. 
186. S. sericea Marsh. Along streams; frequent. 
187. S. jpetiolar is Wet thickets and meadows; 
frequent. 
188. S. cordata Muhl. Wet ground; common. 
BETULACE^. 
Carpinus. 
189. C. caroliniana Walt. Wooded hillsides and 
ravines; common locally. 
OSTRYA. 
190. 0. (Mill.) Willd. High woods; common. 
CORYLUS. 
191. C. americana Walt. Abundant in dry, sparsely 
wooded localities. 
Betula. 
192. B. pa 2 )yrif era Marsh. Woods along the Iowa river, 
near Steamboat Rock and Eldora. 
FAGACE^. 
Quercus. 
193. Q. rubra L. Woods; abundant. 
194. Q. alba L. Dry w^oods; common. 
195. Q. macrocarpa Michx. Woods; abundant. 
ULMACE^. 
Ulmus. 
196. U, americana L. Abundant in low woods. 
197. U. fidva Michx. Abundant in woods. 
Celtis. 
198. 0 . occidentalis L. Common in woods. 
MORACE^. 
Humulus , 
199. AT, lupulus L. Thickets 
infrequent. 
and waste ground; 
