IOWA ACADEMY OP SCIENCE 
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139. Agropyron tenerum Yasey. Slender Wheat Grass. Possibly our 
most abundant native species. 
140. Agropyron richardsonii Schrad. Richardson’s Wheat Grass. 
Rare on dry hills near Mid River. 
HORDEUM (Tourn) L. 
141. Hordeum jubatnm L. Squirrel Tail Grass. A very common and 
widespread weed. 
142. Hordeum pusillum Nutt, Little Barley. Locally plenty in sandy 
areas. 
143. Hordeum nodosum L. Meadow Barley. Not abundant but taken 
at Iowa City and Oxford. 
144. Hordeum pammeli Scrib. & Ball. Pammel’s Barley. A tall erect 
perennial found rarely at Iowa City is placed here upon the 
suggestion of Dr. Trelease of Shaw Botanical Garden. 
ELYMUS L. 
145. Elymus striatus Willd. Slender Wild Rye. Plenty in woodlands. 
146. Elymus striatus Yar. balli Pam. With the typical form. 
147. Elymus striatus Yar. villosus Gray. With the typical form. 
148. Elymus virginicus L. Virginia Wild Rye. Common in woods and 
fields. 
149. Elymus canadensis L. Nodding Wild Rye. Also common, espe- 
cially in sandy soils. 
150. Elymus virginicus Yar. submuticus Hook. Awnless Wild Rye. 
Quite common. 
151. Elymus macounii Yasey. Macoun’g Wild Rye. Rare as an escape 
along a railway. 
HYSTRIX Moench. 
152. Hystrix patula Moench. Bottle Brush Grass. Common in woods 
and wooded marshes. 
CYPERACEAE. 
CYPERUS (Tourn) L. 
153. Cy perns diandrus Torr. Low Cyperus. Abundant along streams. 
154. Cyperus rividaris Kunth. Shining Cyperus. Almost equally 
common. 
