37 



C. viridis (L.) SL-iibii. 



Iowa: Jeffersou, altitude 1.118 feet; Council Bluffs, altitude 990 feet; Carroll, alti- 

 tude 1,240 feet; Sioux City, altitude 1,122 feet. 

 Nebraska: Crete, altitude 1,364 feet, a comnion weed. 



Cenchrus tribuloides L. 



Iowa: Carroll, altitude 1,240 feet; Sioux City, altitude 1,11.") feet; Missouri Valley, 



altitude 1,01.") to 1,028 feet; Council Bluffs, altitude 985 to 995 feet; abuudaut iu 



Iowa along r;iilroads where sand and gravel ballast are used, also in flood plains 



of streams. 

 Nebraska: McCook, altitude 2,517 feet, al)undant ; sandy flood i)lain of Republican 



River. 



ORYZE^. 



Homalocenchriis oryzoides (L.) Poll. 



Iowa: Carroll, altitude 1,2.30 feet ; Sioux City, altitude 1,115 feet; .Jefferson, altitude 

 1,118 feet, abundant in low grounds. 



H. virginicus (Willd. ) Brltt. 



Iowa: Carroll, altitude 1,240 feet; Jefferson, altitude 1,118 feet; Sioux City, alti- 

 tude 1,122 feet, fn-queut. 

 Nebraska: Crete, altitude 1,364 feet, in woods near streams. 



PHALARIDEiE. 

 Phalaris arundinacea L. 



Iowa: Jefferson, altitude 1,118 feet; Sioux City, altitude 1,115 feet. 

 Colorado: Greeley, altitude 4,770 feet, low grottnds along irrigation ditches. 



Savastana odorata (L.) Soribn. 



Colorado: Beaver Creek, Larimer County, altitude 8,500 feet. 



AGROSTIDEiE. 



Aristida fasciculata Turr. 



Nebraska: Lincoln, altitude 1,159 feet ; ilcCook, altitude 2,517 feet; very common not 



only in flood plains of Republican River, near McCook, but on the adjacent hills. 

 Colorado: Denver, altitude 5,182 to 6,000 feet; Golden, altitude 5,691 to 6,000 feet; 



Mount Zion near Golden, altitude 7,500 feet; La Porte, altitude 5,000 feet; Fort 



Morgan. Abundant on the plains, as well as the sandy foothills near La Porte. 



At higher altitudes usually a short grass. 



Stipa coniata Trin. and Rupr. 



Nebraska: MoCook, altitude 2,. 507 feet. 



Colorado : North Cheyenne Canyon near Colorado Springs, altitude 6,000 feet ; Fort 



Collins, altitude 4,984 feet; Fort Morgan; La Porte, altitude 5 095 feet, dry soil, 



red sandstone. 

 Stipa pinnata neo-mexicana Thurb. 

 Colorado: La Porte, altitude 5,095 feet; rare in dry, red soil. 



S. robusta Scriljn. 



Colorado: Long Gulch, Larimer County, altitude 7,800 feet; Bosworth Ranch, Lari- 

 mer County, altitude 7,500 feet, abundant on flats in meadows; Beaver Creek, 

 Larimer County, altitude 9,500 feet. 



S. spartea Trin. 



Iowa: Sioux City, altitude 1,122 feet; Jefferson, altitude 1,118 feet; Council Bluffs, 



altitude 990 to 1,000 feet; a common grass in Iowa ; high, dry prairies and loess 



along the Missouri. 



S. viridula Trin. 



Nebraska: McCook, altitude 2,517 feet, flood plains of Republican River. 

 Colorado: Fort Collins, altitude 4,978 to 5,000 feet, high banks of irrigation ditches; 

 Colorado Springs, altitude 5,978 feet. 



