GRASSES OP IOWA. 91 



Millet or Hungarian grass is widely cultivated in this state; gen- 

 erally as a catch crop. It has established itself chiefly in cities and along 

 railroads. 



DISTRIBUTION. 



Iowa. Le Claire (F. M. Rolfs); Waterloo (Hitchcock); 924 

 Emmet County ( Pammel and Cratty) ; Carnarvon, Sioux City, Jeffer- 

 son, Carroll, Boone, Dakota City, Turin, Logan (Pammel) ; 3144 and 

 3046 Pilot Mound (Miss King and A. MacCorkindale) ; Mt. Pleas- 

 ant (Mills) ; 1 137 Durant (Weaver) ; 27 Des Moines (Ball) ; Ames 

 (181, io2(> Ball, Fisher, Crozier, Hitchcock, Pammel); West Union 

 (Whitmore) ; Van Cleve (Warden) ; Boone (Carver) ; 267 Clinton 

 (Ball). 



North America. From New England to Texas, Nebraska (Crete, 

 Pammel), Iowa, Wisconsin (La Crosse, Pammel; D. S. Pammel and 

 C. M. King 3256 and 3316), and occasionally on the Pacific Coast. An 

 introduced species. 



General. Native to Europe and Asia. Its cultivation seems to 

 been quite common in the temperate regions of Europe and Asia in pre- 

 historic times. 



4. CENCHRUS. 



Cenchrus L. Sp. PI. 1049. 1753. Endlicher. Gen. PI. 85. Bentham 



and Hooker. Gen. PI. 3: 1105. Hackel in Engler and Prantl. Nat. 



Pflanz. Fam. II. 2: 36. /. 30. Scribner. Bull. U. S. Dept.Agrl. Div. 

 Agros. 20: 40. /. 26. 



Spikelets as in Panicum, awnless, but enclosed, 1 to 5 together, in a 

 globular and bristly or spiny involucre, which becomes coriaceous, and 

 forms a deciduous, hard and rigid bur; the involucres sessile in a ter- 

 minal spike. Styles united below. (An ancient Greek name for Set aria 

 It alien.) 



About twelve species occur in the tropical and warmer temperate 

 regions. One species common from Maine to New York, south to Flor- 

 ida, west to Texas, Mexico, California; through Kansas, Colorado, 

 Iowa, Minnesota, Dakota and Ontario. 



