196 
IOWA ACADEMY OP SCIENCES. 
far north as our territory.) Prairies and dry 
woods; abundant. 
24. P. depaujperatum Muhl. Dry prairies; common. 
25. P. virgaium L. Mostly in dry, uncultivated ground; 
common. 
26. F , 'proliferum Lam. Moist ground; common. 
27. P. capillare L. Common everywhere. 
IXOPHORUS. 
28. J. verticillatus (L.) Nash. [SetariamrticillataV>^^wN^ 
Along streets and roads and in cultivated ground; 
local, but apparently increasing. 
29. 1. glaucus (L.) Nash. (S', glauca Beauv.) Abundant 
everywhere. 
30. I. italicus (L.) Nash. (S. Kunth.) Occasional 
in waste ground. 
Cenchrus. 
31. C. tribuloides L. Common in sandy localities, but 
not generally distributed. 
Zizania. 
32. Z. aquatica L. Shallow water of the Iowa river; 
not common. 
Homalocewchrus. 
33. H. virginicus (Willd.) Brit. {Lee7^sia virginica Willd.) 
Common in wet, shady localities. 
34. H, oryzoides (L.) Poll. (P. oryzoides L.) Common in 
swampy ground. 
Phalaris. 
35. P. arundinacea L. Frequent in moist soil. 
Savastina. 
36. S. odorata (L.) Scrib. {Heirochloe borealis Roem. 
and Schultes.) Frequent in moist meadows. 
Aristida. 
37. A. basiramea Eng. Dry prairies; infrequent. 
Stipa. 
38. S. spartea Trin. Dry prairies and meadows; com- 
mon. 
